Marshal of the Soviet Union in 1947 by politician Nikolai Bulganin. Two Marshals were executed in postwar purges: Kulik in 1950 and Beria in 1953, following Stalin's death. Thereafter the rank was awarded only to professional soldiers, with the exception of Leonid Brezhnev, who made himself a Marshal in 1976, and Ustinov, who was prominent in the arms industry and was appointed Defence Minister in July 1976. The last Marshal of the Soviet Union was Dmitry Yazov, appointed in 1990, who was imprisoned after the failed coup against Mikhail Gorbachev in 1991. Marshal Sergei Akhromeev committed suicide in 1991 during the fall of the Soviet
25th Congress of the Communist Party of the Soviet Union or fight other countries, but also stated that he would support national liberation movements, despite détente. Little mention was made of fundamental problems facing the Soviet Union— the slowdown of the rate of economic growth, the low output of agriculture despite heavy investment. The only critical voices raised were those of foreign Communists. French Communist leader Georges Marchais boycotted the congress after criticizing the Soviet Union's suppression of dissidents. A major problem that faced Soviet leaders, and one that was continually evaded, was the need to rejuvenate the Politburo, which was elected at the 1st Plenary Session of the 25th