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Virile George O'Brien straddles the "western" and "crime-flick" genres in RKO Radio's Border G-Men. The plot gets under way when the FBI learns that ammunition and men are being smuggled out of the US and into Mexico in violation of the neutrality act. Federal agent O'Brien is dispatched to Texas to investigate, promptly falling in love with pretty Laraine Johnson (later billed as Laraine Day), whose brother is unwittingly mixed up with the smugglers. Villains John Miljan and Rita LaRoy, in the employ of an unnamed foreign power, use every dirty trick at their disposal to continue their nefarious activities, but O'Brien proves a bit too fast and a great deal too smart for them. Several trade papers applauded RKO Radio's marketing strategy with Border G-Man, which enabled the studio to promote the film as either a straightford western or an espionage adventure, depending upon the demands of the exhibitors.