The LaFollette Civil Liberties Committee, or more formally, Committee on Education and Labor, Subcommittee Investigating Violations of Free Speech and the Rights of Labor (1936-1941), 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 1941, 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 totaled 3,871 for the period. Private security firms like Pinkerton National Detective Agency and Burns were employed to infiltrate labor unions. The Committee concluded that espionage was "the most efficient method known to management to prevent unions from forming, to weaken them if they secure a foothold, and to wreck them when they try their strength."[1]
The Committee also reported:
The inquiry by the Committee failed to achieve any effective regulatory legislation that might have curtailed the worst practices of strike-breaking agencies, but the revelations enraged the public.[1]