Communism
Communism was a human form of government based on equality and sharing of means of production. Karl Marx, Vladimir Lenin and Joseph Stalin were all pivotal figures in communism's history. In 20th century Spain, a communist republican group were elected to govern.
The Soviet Union was a communist state. (PROSE: History 101) Its symbol was the hammer and sickle. (COMIC: Target Practice)
In 1919, the Bolsheviks seized power in Uzbekistan. The Second Doctor, Jamie McCrimmon and Zoe Heriot visited the country shortly afterwards, in August of that year. (AUDIO: The Memory Cheats)
In 1958, Colonel Stark claimed that the Tenth Doctor was a communist to justify killing him. (TV: Dreamland)
In 1989, the Communist regimes in Poland, Hungary and Czechoslovakia were overthrown. In Czechoslovakia, the overthrow was known as the Velvet Revolution and took place on 28 November 1989. The Eleventh Doctor, Amy Pond and Rory Williams were present for that event, and stopped an alien invasion by the Mavora, with the help of the Golem of Prague. (COMIC: The Broken Man)
