After briefly enjoying an "A" budget as Mae West's vis-a-vis in Belle of the Nineties, Johnny Mack Brown returned to the "B"-picture mills with Columbia's Against the Law. Brown plays ambulance driver Steve Wayne, whose devotion to his interne pal Bert Andrews (George Meeker) supersedes all else in his life, including his romance with Martha Gray (Sally Blane). When Bert gets mixed up with gangsters, Steve tries to bail him out, nearly losing his job as a result. Ultimately Bert is bumped off by the villains, leading to a pulse-pounding climax as Steve commandeers his ambulance to bring the mob to justice.
~ Hal Erickson, All Movie Guide