Atheist Governments of the 20th Century: The Death Toll of Godless Goodness
https://www.patheos.com/blogs/publiccatholic/2013/03/atheist-governments-of-the-20th-century-the-death-toll-of-godless-goodness/

Mao Ze-Dong (China, 1958-61 and 1966-69, Tibet 1949-50) 49-78,000,00 people murdered

Jozef Stalin (USSR 1932-39 only) 15,000,000 people murdered

Pol Pot (Cambodia, 1975-79) 1,700,000 people murdered

Kim II Sung (North Korea 1948-94) 1.6 million people murdered

Tito (Yugoslavia 1945-1987) 570,000 people murdered

Suharto (Communists 1967-66) 500,000 people murdered

Ante Pavelic (Croatia 1941-45) 359,000 people murdered

Ho Chi Min (Vietnam 1953-56) 200,000 people murdered

Vladimir Ilich Lenin (USSR, 1917-20) 30,000 people murdered

Adolf Hitler (Germany 1939-1945) 12,000,000 people murdered