who are the chairman of congressional committees chosen by
Procedures of the United States House of Representatives Standing committees are established at the time that the rules of the House are adopted or by amending the House Rules. The jurisdiction of each standing committee is specified in the House Rules. Under the House Rules the chairman and members of standing committees are selected through a two-step procedure where the Democratic Caucus and the Republican Conference recommends members to serve on Committees, the majority party recommends a Chairman, and the Minority Party recommends a Ranking Member and finally the full House can approve the recommendation of the Party Caucuses. It is important to note that the Rules of the Democratic Caucus and the Republican Conference determines the nomination procedure of its own members. Rules of party nominations may therefore differ but approval by the House of these nominations is conducted according to House Rules. Seniority on a Standing Committee is based on the order of the members on the election resolution as approved by the House. The number of members who serve on a committee along with the party ratio of a committee is determined by the Majority and Minority Leaders of the House with the exception of the Committee on Ethics which is limited by the Rules to 5 majority members and 5 minority members.
House Un-American Activities Committee On May 26, 1938, the House Committee on Un-American Activities was established as a special investigating committee, reorganized from its previous incarnations as the Fish Committee and the McCormack-Dickstein Committee, to investigate alleged disloyalty and subversive activities on the part of private citizens, public employees, and those organizations suspected of having communist or fascist ties; however, it concentrated its efforts on communists.[10][11] It was chaired by Martin Dies Jr. (D-Tex.), and therefore known as the Dies Committee.