Violations of free speech and rights of labor. Part 12, Harlan County, April 26, 27, 28, and 29, 1937 : hearings before a subcommittee of the Committee on Education and Labor, United States Senate, Seventy-fifth Congress, first session pursuant to S. Res. 266 (74th Congress), a resolution to investigate violations of the right of free speech and assembly and interference with the right of labor to organize and bargain collectively