53 million dead in the US alone, oh well.
Rachel Carson (author of "Silent Spring" which resulted in the DDT ban): 50-80 MILLION deaths and rising every year.
Margaret Sanger: 46 MILLION deaths worldwide EVERY YEAR (1.4+ BILLION worldwide since 1900, over 1.3 BILLION since 1980).
Stalin: 13 MILLION+ deaths.
Hitler: 12 MILLION+ deaths.
Mao: 50-80 MILLION deaths.
Now, this is well over 1.6 BILLION deaths caused by just a few people in the past century. And the deaths attributed to Mao, Stalin and Hitler ONLY include direct acts of genocide, not their wars.