Who was the leader of the USSR in the 1980s?

Leonid Brezhnev from the 14th of October 1964 until the 10th of November 1982

Yuri Andropov from the 12th of November 1982 until the 9th of February 1984

Konstantin Chernenko from the 13th of February 1984 until the 10th of March 1985

Mikhail Gorbachev from 11th of March 1985 until the 25th of December 1991