Alexander Dubcek attempts to liberalize communist rule in Czechoslovakia but is stopped by the Warsaw Pact invasion.
Editors. "Warsaw Pact countries invade Czechoslovakia to stamp out the "Prague Spring"". The Literary Encyclopedia. First published 01 February 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=3482, accessed 22 May 2015.]