Since using a
positivist Communist philosophy to justify
totalitarian rule is pretty much the same as justifying that rule by
Divine Right, we might as well list the strongmen of the
Soviet Union
in this node. Although paramount power passed through various offices during
the Soviet Union's existence, the top man was usually "General Secretary
of the Communist Party of the Soviet Union".
On December 25, 1991, Mikhail Gorbachev resigned as General Secretary and
President, and the Soviet Union ceased to exist. Power devolved onto
the (somewhat) democratically elected presidents of the
Russian Federation.
Thanks to www.brittanica.com for the
patronymics and dates, and the knowledge about
Bulganin (I had thought he had been General Secretary for a while).