PBS is always running a show about this. I have not seen any shows on the communists killing 100 million+ people. Maybe next season....
Mao’s “Great Leap Forward” killed 45 million in four years alone: http://www.independent.co.uk/arts-entertainment/books/news/maos-great-leap-forward-killed-45-million-in-four-years-2081630.html
Throw in all of the other tens of millions murdered by the ChiComs and the tens of millions killed by Stalin, other Soviets, Pol Pot, Ho Chi Minh, Castro, etc., and the number of civilian victims of the Communist genocide probably approaches 200 million.