"Tankie" is a term originally used within the left-wing political sphere to describe those who supported the Soviet Union, including its use of military force to maintain its influence over its satellite states, particularly referring to the crushing of the Hungarian Revolution in 1956 and the Prague Spring in 1968 with tanks. Today, it's often used more broadly, sometimes pejoratively, to describe people who uncritically support or idealize authoritarian socialist or communist regimes, often ignoring or downplaying their human rights abuses.