July 14, 1956 – Harlem gang called the Politicians stab and kill a man by the name of McMullen outside a bar in a mugging gone horribly wrong.
July 18, 1956 – Two Black girl gangs from the Navy Yard district of Brooklyn — the Diplomat Queens and the Chaplains get in a fight on the subway and Evelyn Orr, 12 years old dies in the fracas. This is the only girl gang homicide I have come across between 1955-1959.
August 31, 1956 – Jose Santiago, 15 years old is stabbed to death by a gang called the Royal Counts. Santiago was a member of a gang called the Ellery Bops from the border of Bedford-Stuyvesant and Williamsburg.