Czar Rennis (“Sinner” spelt backwards) was an underworld kingpin and the boss of Jimmy “Trigger” Doom. Czar was dissatisfied with Trigger’s operation of his slot machine racket, and planned to have the man killed. Trigger suspected this, and decided to kill Czar first. Trigger used a photograph of Czar’s apartment building to determine which window was his. Trigger then shot Czar from his own hotel room across the street (June 27th, 1941).