Circle of Six: The True Story of New York's Most Notorious Cop-Killer and The Cop Who Risked Everything to Catch Him. http://www.amazon.com/Circle-Six-Notorious-Cop-Killer-Everything/dp/1932857397CIRCLE OF SIX The True Story of New York's Most Notorious Cop-Killer and the Cop Who Risked Everything to Catch Him In 1972, New York City was plagued with protests, riots, and general unrest. It was during this defining year that one of the Police Department's most scandalous cases occurred: the murder of Police Officer Phillip Cardillo. On Friday, April 14, 1972, the police were summoned to Mosque Number 7 in Harlem, led at the time by the Nation...