Subcommittee rosters for the current Congress are posted on the Senate and House websites.
A list of Senate committee and subcommittee assignments is published by the secretary of the Senate and the clerk of the House each congress. This list is republished irregularly during each congress to reflect major changes in committee membership. The title of this list is generally a variation of the title, List of Standing Committees and Subcommittees and Select and Special Committees and Committee Assignments. Lists are available dating from April 1, 1975. The Senate publication is available online from 2007 to April 2017, as is the current House publication.
GPO's govinfo provides links to the Congressional Directory from the 104th Congress (1995-1996) onward. Select the Directory you would like to search and then select "Senate Committees" or "House and Joint Committees." Then select “Standing Committees of the Senate” or “Standing Committees of the House.” Within those documents, members of each committee and subcommittee are listed.
The Congressional Directory may be available in large library systems or college libraries, frequently as a part of their participation in the Federal Depository Library Program (FDLP). Over 1,100 libraries participate in the FDLP, collecting and/or providing public access to government documents. A list of depository libraries is available on the Government Printing Office (GPO) website. Since most depository libraries are within a university or state library, calling ahead to ask about hours is advised.
United States Code Congressional and Administrative News (USCCAN) is a commercially produced publication carried by many law libraries and large public or academic libraries. Check with these types of libraries in your community to see if they subscribe to USCCAN and to verify the policies on use of their facilities.
Informal congressional groups and organizations of members with shared interests in specific issues or philosophies have been part of the American policymaking process since colonial times. Typically, these groups organize without official recognition by the chamber and are not funded through the appropriation process.
In the Senate there is one officially recognized caucus -- the Senate Caucus on International Narcotics Control established by law in 1985.
Joint Select Committee on Budget and Appropriations Process Reform
Joint Select Committee on Solvency of Multiemployer Pension Plans
The Bipartisan Budget Act of 2018 (P.L. 115-123), signed into law on February 9, 2018, created two new joint select committees of the House and Senate. Each committee is made up of 16 members from the House (8 members) and Senate (8 members). Both committees are scheduled to terminate on December 31, 2018, or 30 days after submission of their final report.