Discuss:What was Communism?

references from
-D. Lane, The Rise and Fall of State Socialism
-Fred Halliday, ‘What was Communism?’
-C. Pierson, Socialism After Communism
examples of communism through europe and asia. Level of democracy in these countries.
The change in eastern european countries after the end of soviet union.
capitalism and liberalism connection.
reasons for communism collapse.