The Rangers' Round-Up (1938)

Unknown to Doc Aikman (Earle Hodgins), a band of outlaws is following his traveling medicine-show wagon as cover for their robberies, with one of the gang members, Hank (Karl Hackett), working with the troupe. Texas Ranger Tex Duncan (Fred Scott) joins the troupers as a singer, while another Ranger, Jim (Sydney Chatton), joins the outlaw gang. Tex becomes involved with Marie (Christine McIntyre), a saloon singer, who is trying to help her brother Al (Robert Owen), escape the gang.