Despite the ridicule of the rest of the East Side Kids, Mugs Maloney (Leo Gorcey) aspires to be a jockey. He gets his chance with the help of elderly stablehand Ben (Clarence Muse), the owner of a thoroughbred race horse. Ben agrees to train Mugs on the condition that the rest of the gang raise enough money to enter his horse in a Big Race. Alas, Mugs turns out to be a terrible jockey, but this doesn't dissuade a wealthy horseman from offering to race the thoroughbred with a different boy in the saddle. Resentful of being passed over, Mugs does everything he can to sabotage the rival jockey, but in the end he relents and allows the other boy to ride the horse to victory. Beautifully directed by Joseph H. Lewis (especially in the racing scenes), That Gang of Mine is a superior "East Side Kids" romp, marred only by the unecessary racist badinage between black actors Clarence Muse and Sunshine Sammy Morrison.