 "Arizona Gang Busters" (the title shown on the film, all of the posters and cards and newspaper ads) is another pre-WWII sabre-rattler that finds a band of renegade gunmen, under the pretense of developing an irrigation project for the reclamation of arid desert land, using airplanes and parachute jumpers to gather valuable military information for a European power. Their actions raise the suspicions of rancher Lambert (Forrest Taylor) and his daughter Sue (Pauline Haddon), who raise horses for the Eastern market. Sue communicates with the Commander (Karl Hackett) of the American Legion post. Washington sends five federal agents and two are murdered and three vanish completly. Sue s sweetheart, Sheriff Dan Kirk (Kenne Duncan), does not share her concerns, and has no knowledge of the identity of Marshal Trigger Tim Rand (Tim McCoy) and his pal, Lanky (Lou Fulton) while they work to solve what has become a national defnse problem. Despite the efforts by the sheriff to arrest them, Tim and Lanky, with the aid of a mysterious rider known as Gringo who is really Captain Rodriguez (Julian Rivero) of the mexican National Police, bring to an end the subversive activities of Schmidt (Arno Frey) and Marion (Pail Ellis.)