May 1 – Alvin "Creepy Karpis" Karpowicz is arrested in New Orleans, he is the last of the public enemies to be captured and is the only public enemy to be captured alive.
July 15 – President Franklin Roosevelt orders the arrest of Ignazio "the Wolf" Lupo for violating the terms of his parole to serve the remaining sentence stemming from a counterfeiting charge in 1918.
August – While again attempting to return to Manhattan, Ciro Terranova is arrested on a second vagrancy charge and is held in custody.
August 17 – "Big Nose" John Avena, leader of the Philadelphia crime family, is gunned down by the rival Lanzetti Brothers. This would begin a five-year gang war lasting until the death of William Lanzetti in 1939. After Avena's death, underboss Joe Bruno assumes control of the Philadelphia organization from his headquarters in New Jersey.