Strikebound.

Via the New York Times: "...reconstructs the true story of a coal miners' strike in the small town of Korumburra in the mid-30's... based on the real-life story of two remarkable characters, Wattie Doig, a miner who became a militant Communist activist, and his wife, Agnes, who progressed from staunch Presbyterianism to membership in the Salvation Army and, finally, to labor organization."