Fundamental reason why communist nations are the most corrupt ones

What is Communism?
What is capitalism?
Then why eventually the communist countries became corrupt?
Today we see all communist nations are ruled by corrupt PLUTOCRATS with a dictator at the head.
Since the PLUTOCRATS have deep influence on the ruling elite:
DISCLAIMER: The author is solely responsible for the views expressed in this article. The author carries the responsibility for citing and/or licensing of images utilized within the text.