Realizing that he faced execution if convicted, Reles became a government witness. Reles implicated his boss Lepke Buchalter in the murder of Brooklyn candy store owner Joseph Rosen; Buchalter was eventually convicted and executed for this crime. Reles's information also implicated Louis Capone, Mendy Weiss, Harry Maione, Harry Strauss, Frank Abbandando, Irving ("Knadles" and "the Plug") Nitzberg, and even his own childhood friend "Buggsy" Goldstein.