Orange picker Leroy Jones inadvertently becomes a union leader and is forced out of town, leaving behind his sex-obsessed father, Rufus, and timid spouse, Annie Mae. He heads for Los Angeles, where he falls for union organizer Vanetta. Annie Mae seeks solace from local preacher Lenox Thomas, who eventually impregnates her. When Leroy catches wind, he heads home for a showdown with Lenox.

Mary Rafferty comes from a poor family of steel mill workers in 19th Century Pittsburgh. Her family objects when she goes to work as a maid for the wealthy Scott family which controls the mill. Mary catches the attention of handsome scion Paul Scott, but their romance is complicated by Paul's engagement to someone else and a bitter strike among the mill workers.

Documentary overview of the life and causes of "Mother" Jones.