However , internal and external unrest Violence , which the Tsar believed stemmed from political liberalisation Reforming_a_system , led to Causation a series of repressions Control and a return to a former government of restriction and conservatism .

the invasion Attack successfully stopped Process_end alexander UNK 's prague spring liberalisation reforms Reforming_a_system and strengthened Cause_change_of_strength the authority of the authoritarian wing within the communist party Social_event of czechoslovakia ( unk ) .