According to Wikipedia, Heinrich Mueller, (b. April 29, 1900) Chief of the Gestapo and Adolf Eichmann's boss, "disappeared in May 1945 and remains the only senior figure of the Nazi regime who was never captured or confirmed to have died."
In fact, the Gestapo chief escaped to Switzerland where he worked for the government under an assumed name. In 1948, the CIA recruited him as a Soviet counter espionage specialist because the US government was rife with Communists. Frank Wisner and James Kronthal hired him for $50K annual salary and a $1 million signing bonus.
Mueller was soon on a first-name basis with President Harry S. Truman.. Wearing his Nazi medals, Mueller entertained Truman at home, played Bach, and gave him stolen art and a case of fine whiskey. Truman may be his son's godfather.
Mueller came to the US with his Gestapo helpers and soon had Washington bugged. He spied on his CIA superiors and informed Truman that they were tapping his phone. He advised Truman on Soviet intentions during the Korean War based on his contacts with Soviet spies in Washington, (including Kim Philby) and his experience as the Communists' Number One Nemesis.