"1900Z"^^ . . "1900-03-10Z"^^ . . "FBI double agent" . "William G. Sebold (Wilhelm Georg Debrowski; 10 March 1899 in M\u00FClheim, Germany \u2013 16 February 1970 in Walnut Creek, California) was a United States citizen when he visited Germany and was coerced into becoming a spy. He informed the American Consul General in Cologne before leaving Germany and became a double agent for the FBI. With the assistance of another German agent, Fritz Duquesne, he recruited 32 agents that became known as the Duquesne Spy Ring."@en . . "Sebold, William G."@en . "Wilhelm Georg Debrowski"@en . "1970Z"^^ .