The Congressional Research Service (CRS) is a public policy research institute of the United States Congress. Operating within the Library of Congress, it 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.
CRS has roughly 600 employees, who have a wide variety of expertise and disciplines, including lawyers, economists, historians, political scientists, reference librarians, and scientists. In the 2023 fiscal year, it was appropriated a budget of roughly $133.6 million by Congress.