 The United States Senate Select Committee on Improper Activities in Labor and Management ( also known as the McClellan Committee ) was a select committee created by the United States Senate on January 30 , 1957 , and dissolved on March 31 , 1960 . The select committee was directed to study the extent of criminal or other improper practices in the field of labor @-@ management relations or in groups of employees or employers , and to suggest changes in the laws of the United States that would provide protection against such practices or activities . It conducted 253 active investigations , served 8 @,@ 000 subpoenas for witnesses and documents , held 270 days of hearings , took testimony from 1 @,@ 526 witnesses ( 343 of whom invoked the Fifth Amendment ) , and compiled almost 150 @,@ 000 pages of testimony . At the peak of its activity in 1958 , 104 persons worked for the committee . 
