Adolf Tolkachev

Adolf Georgiyevich Tolkachev (; 6 January 1927 – 24 September 1986) was a Soviet electronics engineer. He provided vital documents to the United States Central Intelligence Agency (CIA) between 1979 and 1985. Working at the Soviet radar design bureau Phazotron as one of the chief designers, Adolf Tolkachev gave the CIA complete detailed information about projects such as the R-23, R-24, R-33, R-27, and R-60, S-300 missile systems; fighter-interceptor aircraft radars used on the MiG-29, MiG-31, and Su-27; and other avionics. KGB Police executed him in Moscow for being a spy in 1986. Provided by Wikipedia