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Congressional Research Service

Logo: U.S. Government, Public domain, via Wikimedia Commons3

U.S. Congress-affiliated think tank

The Congressional Research Service (CRS) is a nonpartisan public policy research institute under the Library of Congress of the United States Congress. CRS works primarily and directly for members of Congress and their committees and staff on a confidential, nonpartisan basis. CRS is sometimes known as Congress's think tank due to its broad mandate of providing research and analysis on all matters relevant to national policymaking.2 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

1914Founded1

The Congressional Research Service (CRS) is a nonpartisan public policy research institute under the Library of Congress of the United States Congress. CRS works primarily and directly for members of Congress and their committees and staff on a confidential, nonpartisan basis. CRS is sometimes known as Congress's think tank due to its broad mandate of providing research and analysis on all matters relevant to national policymaking.2

Corporate structure

Congressional Research Service is part of a group headed by Library of Congress. 26 entities, 1 country on record. Switch between the flow chart and the network, and select any entity to see its details.

  • Library of Congress Washington, the District of Columbia, United States
    • Congressional Research Service Washington, D.C.
    • Cataloging Distribution Service Subsidiary · James Madison Memorial Building, United States
    • Library of Congress Publishing Office Subsidiary
    • American Folklife Center Subsidiary · Washington, D.C., United States
    • Copyright Royalty Board Subsidiary · United States
    • Division of Maps Subsidiary · Washington, D.C., United States
    • Division of Maps and Charts Subsidiary · Washington, D.C., United States
    • Federal Research Division Subsidiary · United States
    • ISSN National Centre for the USA Subsidiary · Washington, D.C., United States
    • Library of Congress African and Middle Eastern Division Subsidiary · United States
    • Library of Congress Cooperative Cataloging Team Subsidiary · Washington, D.C., United States
    • Library of Congress Geography and Map Division Subsidiary · Washington, D.C., United States
    • Library of Congress Manuscript Division Subsidiary · Washington, D.C., United States
    • Library of Congress Music Division Subsidiary · Washington, D.C., United States
    • Library of Congress Network Development and MARC Standards Office Subsidiary · Washington, D.C., United States
    • Library of Congress Police Subsidiary · United States
    • Library of Congress Prints and Photographs Division Subsidiary · Washington, D.C., United States
    • National Audio-Visual Conservation Center Subsidiary · Culpeper County, United States
    • National Coordinated Cataloging Program Subsidiary · United States
    • National Film Registry Subsidiary · United States
    • National Library Service for the Blind and Print Disabled Subsidiary · Washington, D.C., United States
    • Office of the Inspector General, Library of Congress Subsidiary · United States
    • Rare Book and Special Collections Division Subsidiary · Washington, D.C., United States
    • United States Copyright Office Subsidiary · United States
    • US Center for the Book Subsidiary · United States
    • and 9 more

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); subsidiaries, stakes and holdings from Wikidata (CC0). Each entity in the chart links to its source.

The story

History

In 1914, Senator Robert La Follette Sr. and Representative John M. Nelson, both of Wisconsin, promoted the inclusion in the legislative, executive, and judicial appropriations act of a provision directing the establishment of a special reference unit within the Library of Congress. Building upon a concept developed by the New York State Library in 1890 and the Wisconsin Legislative Reference Library in 1901, they were motivated by Progressive Era ideas about the importance of the acquisition of knowledge for an informed and independent legislature. The move also reflected the expanding role of the librarian and the professionalization of the profession. The new department was charged with responding to congressional requests for information. The legislation authorized the librarian of Congress, Herbert Putnam, to "employ competent persons to prepare such indexes, digests, and compilations of laws as may be required for Congress and other official use..."

Renamed the Legislative Reference Service and given a permanent authorization with the Legislative Reorganization Act of 1946, it assisted Congress primarily by providing facts and publications and by transmitting research and analysis done largely by other government agencies, private organizations, and individual scholars. Verner W. Clapp headed the unit.

The Library of Congress, the home of CRS, had experimented during the 1940s with unrestricted publication Public Affairs Bulletins, which were produced by staff of the Legislative Reference Service, and devoted to various public policy issues. They were promoted by Archibald MacLeish, the librarian of Congress, and, among other topics, addressed timely policy issues, such as American national defense. About 100 Public Affairs Bulletins were generated before congressional appropriators ended their production in 1951.

The renaming under the Legislative Reorganization Act of 1970 reflected the service's changing mission: This legislation directed CRS to devote more of its efforts and increased resources to doing research and analysis that assists Congress in direct support of the legislative process.

The Congressional Research Service Review launched in 1980 and continued until the early 1990s; then congressional appropriators, once again, invoked "fiscal closure." The Review was published ten times a year and was available to the public by subscription. It offered analytical articles, summaries of CRS research products, and other assistance to the congressional community.

Inquiries increased from 400,000 questions per year in 1980 to 598,000 in 2000. CRS was reorganized in 1999 partly to handle the load, relocating staff, adopting more efficient workstations, and attempting to enable more communication across disciplinary specialists.

CRS reports were not generally available to the public until September 18, 2018, when a provision of the Consolidated Appropriations Act of 2018, which directed that CRS reports be available to the public, was implemented.

1997 CRS memorandum

In a December 1997 memorandum, the CRS summarized the "Legal Issues Presented by Proposals for the General Release of CRS Products to the Public":

Read the full text

Speech and debate immunity: Reducing "substantial role in the legislative process". Such proposals might "cause the judiciary and administrative agencies to reassess their perception of CRS as playing a substantial role in the legislative process, and thereby might endanger a claim of [Speech and Debate Clause] immunity even in an instance in which CRS was fulfilling its legislative mission (e.g., by preparing a confidential memorandum for a Member on a pending bill.)"

Libel, slander, and defamation. CRS also believes that slander or libel actions might occur more frequently if CRS products were put on the Internet, because more people would read CRS products and know of their existence.

Confidentiality of CRS files. CRS believes that broader dissemination of CRS products would likely inspire more litigants who wish to obtain, for purposes of discovery, the files of CRS analysts. This might, CRS argues, cause the public release of correspondence between Members of Congress and CRS.

Copyright infringement. CRS argues that it might be subject to claims of copyright infringement if CRS products were available on the Internet. CRS sometimes incorporates copyrighted work into its reports and products. (Elsewhere, the CRS notes that these inclusions are always "appropriately credited".)

From Wikipedia’s article on Congressional Research Service, shared under CC BY-SA 4.0.4

Products and brands

  • Congressional Research Service report

Listed on Wikidata.1

Overview of services

Responses to congressional requests take the form of reports, memoranda, customized briefings, seminars, videotaped presentations, information obtained from automated databases, and consultations in person and by telephone.

CRS "supports the Members, committees, and leaders of the House and Senate at all stages of the legislative process":

Ideas for legislation. A 2008 CRS report details how the service can assist legislators in evaluating the need for legislation:

At the preliminary stage, members may ask CRS to provide background information and analysis on issues and events to better understand the existing situation and then assess whether a problem requires a legislative remedy. This assistance may be a summary and explanation of the scientific evidence on a technically complex matter, for example, or it may be a collection of newspaper and journal articles discussing an issue from different perspectives, or a comparative analysis of several explanations that have been offered to account for a generally recognized problem. CRS also identifies national and international experts with whom Members and staff may consult about whatever issues concern them and sponsors programs at which Members meet with experts to discuss issues of broad interest to Congress.

Read the full text

Analyzing a bill. The same 2008 report also clarifies the various ways in which the service further supports the work of legislators once a bill has been introduced:

If a Member decides to introduce a bill, CRS analysts can assist the legislator in clarifying the purposes of the bill, identifying issues it may address, defining alternative ways for dealing with them, evaluating the possible advantages and disadvantages of each alternative, developing information and arguments to support the bill, and anticipating possible criticisms of the bill and responses to them. Although CRS does not draft bills, resolutions, and amendments, its analysts may join staff consulting with the professional draftsman within each chamber's Office of the Legislative Counsel as they translate the Member's policy decisions into formal legislative language. Members and committees can also request CRS to help them assess and compare legislative proposals, including competing bills introduced by Members and proposals presented by executive branch officials, private citizens, and organizations. CRS can assess the various proposals' intent, scope, and limits.

The report goes on:

During committee and floor consideration, CRS can assist Representatives and Senators in several different ways, in addition to providing background information to assist Members in understanding the issues a bill addresses. CRS attorneys can help clarify the legal effects the bill may have. CRS policy analysts can work with members to decide whether to propose amendments and then make certain that their amendments are designed and phrased to achieve the desired results. CRS also can help Members prepare for the debate by providing data and other information that they can use to support the positions they have decided to take.

Hearings. When a subcommittee selects a bill (or several bills on the same subject) for serious attention, it usually begins by conducting public hearings on one or more days at which executive branch officials, other Members of Congress, representatives of private organizations, and even individual citizens present their views on the bill's merits. CRS analysts can assist in this process by providing background information and reports, presenting a preliminary briefing to Members or staff, identifying potential witnesses, and suggesting questions that Members may consider asking the witnesses.

Subcommittee or committee votes. After the hearings on a bill, the subcommittee or committee meets to debate and vote on amendments to it. If requested, CRS staff may attend these meetings to serve as a nonpartisan source of expert information available to all Members. If the subcommittee and then the full committee conclude that new legislation is needed, they report a bill to the House or Senate for all its Members to consider. The committee also submits a written report explaining its decision's background, analyzing the purposes and effects of each major provision of the bill, and includes other information, such as predictions about the cost of implementing it, that helps other Members decide whether they should support the bill. CRS specialists may assist the committee's staff in preparing some sections of this report, although the Congressional Budget Office develops cost estimates.

Parliamentary procedure. CRS staff can clarify the legislative procedures of the House and Senate, assisting Members and staff in understanding the effects of these procedures and how Members can use the procedures to promote their own legislative goals.

Conference committees. CRS analysts can contribute to this last stage of the legislative process by helping identify the issues to be resolved, by clarifying and comparing the positions of the two houses on each issue, and by identifying different ways in which the legislative disagreements could be resolved.

CRS also performs several functions that support Congressional and public understanding of the legislative process and other issues.

Bill Summaries. Since 1935, the Legislative Analysis and Information Section (formerly "Bill Digest") of CRS has had statutory responsibility for the preparation of authoritative, objective, nonpartisan summaries of introduced public bills and resolutions and maintenance of historical legislative information. Detailed revised summaries are written to reflect changes made in the course of the legislative process. This CRS office also prepares titles, bill relationships, subject terms, and Congressional Record citations for debates, full texts of measures, and Member introductory remarks. The bill summaries were released to the public via THOMAS, the Library of Congress's online database, but are now released via Congress.gov.

Constitution Annotated. The American Law Division of the Congressional Research Service prepares The Constitution of the United States of America: Analysis and Interpretation (popularly known as the Constitution Annotated), a continually updated legal treatise that explains the U.S. Constitution as it has been interpreted by the U.S. Supreme Court.

Congressional Research Service reports

Reports by the Congressional Research Service, usually referred to as CRS Reports, are the encyclopedic research reports written to define issues in a legislative context clearly.

Over 700 new CRS reports are produced each year; 566 new products were prepared in Fiscal Year 2011. Nearly 7,800 were in existence as of the end of 2011.

The types of CRS reports include Issue Briefs (IB), Research Memos (RM), and Reports, which appear in both Short (RS) and Long (RL) formats.

Air War College of the United States Air Force published a categorical listing of CRS reports, last updated on May 13, 2011.

Letter of Stanley M. Brand

On January 27, 1998, Stanley M. Brand, the former general counsel to the House of Representatives, wrote a letter to Senator John McCain:

Concerning applicability of the Speech or Debate Clause, U.S. Const. art. I, 6, cl. 1, to certain CRS products which your bill would, if enacted, make available on the Internet, I believe that the concerns expressed in the CRS memorandum are either overstated, or the extent they are not, provide no basis for arguing that protection of CRS works will be weakened by your bill.

(See also his letter addressing a 2001 reintroduction of the same legislation.)

John McCain cited this letter on the Senate floor when he was proposing an amendment to the Legislative Branch Appropriations Act 1999 that would direct the Director of the Congressional Research Service to post "CRS Reports to Congress" and "CRS Issue Briefs" on the Internet. In this speech, he also noted:

I would like to point out that the Rules Committee has approved a decentralized system, where Senators can release CRS products on their private web pages. I see no difference between the release of CRS material on one hundred independent web pages and THOMAS, a Congressionally mandated web page. Both approaches should protect CRS equally.

I also urge my colleagues not to believe other arguments that CRS will suffer from a huge rise in workload from this amendment. It will require only two computer technicians to set up this web site, and keep it updated. CRS already has a process for deciding which information goes up on their web site for Members of Congress. This bill only asks that they duplicate this process for a public version of that web page. Also, we release paper copies of these products to our constituents every day without causing a great strain to CRS staff. Finally, I have the results of an analysis of state legislative research organizations that do work similar to CRS and post these products on the Internet. None of these organizations have complained of a huge increased workload from releasing their products to the Internet.

Written work-product

Document types include CRS reports, appropriations reports (usually released as long Reports), and congressional distribution memoranda.

CRS reports

The most commonly requested CRS product is the general congressional distribution reports, known as "CRS reports". The purpose of a report is to clearly define the issue in the legislative context. The types of CRS reports include Issue Briefs (IB), Research Memos (RM), and Reports, which appear in both Short (RS) and Long (RL) formats.

Other than a passing generic reference to "reports" in its statutory charter, CRS has no mandate for these products. They are created in the context of the overall mission of CRS to provide research support to Congress.

The reports may take many forms, including policy analysis, economic studies, statistical reviews, and legal analyses.

CRS reports are considered in-depth, accurate, objective, and timely, and topped the list of the "10 Most-Wanted Government Documents" survey by the Center for Democracy and Technology in 1996.

From Wikipedia’s article on Congressional Research Service, shared under CC BY-SA 4.0.4

Subsidiaries and ownership

Parent company

From Wikidata.1

Timeline

  1. 1914Acquired Acquired by Library of Congress1
  2. 1914Founded Founded1