Alexander Dubcek attempts to liberalize communist rule in Czechoslovakia but is stopped by the Warsaw Pact invasion.
Citation:
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 2013.]