"The Congressional Research Service (CRS) works exclusively for the United States Congress, providing policy and legal analysis to committees and Members of both the House and Senate, regardless of party affiliation. As a legislative branch agency within the Library of Congress, CRS has been a valued and respected resource on Capitol Hill for more than a century.
CRS is well-known for analysis that is authoritative, confidential, objective and nonpartisan. Its highest priority is to ensure that Congress has 24/7 access to the nation’s best thinking." (Library of Congress, Congressional Research Service)
Note: Unlike many government documents, CRS reports are not made directly available to the public, but there are some community-driven efforts to collect CRS reports (through requests to Members of Congress and from agency websites) and provide access to them. See OpenCRS and the UNT Digital Library, below.