LaFollette Civil Liberties Committee or more formally, Committee on Education and Labor, Subcommittee Investigating Violations of Free Speech and the Rights of Labor (1933-1941) began as an inquiry into a National Labor Relations Board (NLRB) investigation of methods used by employers in certain industries to avoid collective bargaining with unions. Between 1936 and 1944, the subcommittee published exhaustive hearings and reports on the use of industrial espionage, private police systems, strikebreaking services, munitions in industrial warfare, and employers' associations to break strikes and to disrupt legal union activities in other ways. Robert M. La Follette, Jr., a Republican and Progressive Party Senator from Wisconsin chaired the Committee.
The Committee reported that as late as 1937 its census of working "labor spies" from 1933 to 1937 total 3,871 for the period. Private security firms like Pinkerton National Detective Agency and Burns were employed to infiltrate labor unions.
The Committee reported:
In 1995, with the release of the Venona project transcripts, so far as is known, no less than four American citizens, employees of the federal government, Senate staffers, illegal members of the Communist Party of the United States (CPUSA) as defined by the Hatch Act of 1939, and agents of the CPUSA's secret appartus working on behalf Soviet intelligence, furthing the objectives of the Comintern, were at one time or another staff members of the subcommittee.
Those agents who have been idnetified are: