Labor Action (San Francisco). Vol. 1 No. 15. April 17, 1937.
There have been a number of periodicals named Labor Action. This Labor Action was published weekly in San Francisco in 1936 and 1937, edited by James P Cannon, as the official organ of the Socialist Party of California, then dominated by Fourth Internationalist followers of Leon Trotsky engaged in an intervention, the “French Turn,” into the Socialist Party. This Labor Action played close attention to the CIO movement and contains a wealth of information on CIO history in the West of that time. The Trotskyists were expelled in late 1937, founding the Socialist Workers Party in early 1938.
Link to PDF of full issue: https://www.marxists.org/history/etol/newspape/laboraction-ca/v1n15-apr-17-1937.pdf