Willie "Two-Knife" Altieri,Mob boss Yale used Altieri on many occasions to commit murders. In 1919, Yale sent Altierri to silence an informer within the gang. Altierri stabbed the informer in the torso with both knives, then broke off blades in the victim's body. Altierri later presented the handles to Yale, who mounted them on a plaque and hung it up in his office.Wikipedia