Karl Marx, the father of Communism.

No Marx, no dictatorship of the proletariat. No dictatorship of the proletariat, no Communism. No Communism, no 100 million people who get murdered, starved, executed and generaly killed in very nasty ways, worldwide, for the glory of the revolutionary Communist utopia.

Source: https://archive.org/stream/TheBlackBookofCommunism10/the-black-book-of-communism-jean-louis-margolin-1999-communism_djvu.txt