Prague 1968 - Soviet tanks invade Prague bringing to an end the Prague Spring and the idea of Dubcek's socialism with a human face.
Zatopek possibly greatest Olympic runner of all time protesting the invasion of his country.
A hero in his native country, Zátopek was an influential figure in the Communist Party. However, he supported the party's democratic wing, and after the 1968 Prague Spring, he was stripped of his rank and expelled from the army and the party,[9] removed from all important positions and forced to work in a string of inferior and dangerous positions, such as a uranium mine, refuse collection service, and well digging. (Wikipedia)
Prague 1990 - The Velvet Revolution
Vaclav Havel - Addressing his people after the peaceful overthrow of the totalitarian communist occupation.