Start at the top with Karl, and work your way around to the right... :D :D :D

Vladimir Lenin, Josef Stalin, Chairman Mao, Kim II Jung, Kim II Sun, Fidel Castro, Che Guevara, Ho Chi Minh, Pol Pot, Hugo Chavez, Nicolas Maduro and others come to mind. Thousands of supporters and opponents imprisoned and executed. Communism has worked really well.

Sadly that is the communist cycle. ☹ Have you ever noticed no one is ever entering their country illegally. However, they do shoot a lot of people trying to leave it though.