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Historically, atheism has generally been an integral part of [[communism|communist]] ideology (see: [[Atheism and communism]]).  According to the [[University of Cambridge]], historically, the "most notable spread of atheism was achieved through the success of the 1917 [[Russian Revolution]], which brought the [[Marxism-Leninism|Marxist-Leninists]] to power."<ref name="Marxism-Leninism">{{cite web|url=https://web.archive.org/web/20130728215151/http://www.investigatingatheism.info/marxism.html|title=Investigating atheism: Marxism|publisher = [[University of Cambridge]]|quote=The most notable spread of atheism was achieved through the success of the 1917 Russian Revolution, which brought the Marxist-Leninists to power. For the first time in history, atheism thus became the official ideology of a state.|year=2008|accessdate=July 17, 2014}}</ref> Under atheistic [[communism]] tens of millions of people were killed and many people were tortured (see: [[Atheism and Mass Murder|Atheism and mass murder]] and [[Atheistic communism and torture]]).  

Historically, atheism has generally been an integral part of [[communism|communist]] ideology (see: [[Atheism and communism]]).  According to the [[University of Cambridge]], historically, the "most notable spread of atheism was achieved through the success of the 1917 [[Russian Revolution]], which brought the [[Marxism-Leninism|Marxist-Leninists]] to power."<ref name="Marxism-Leninism">{{cite web|url=https://web.archive.org/web/20130728215151/http://www.investigatingatheism.info/marxism.html|title=Investigating atheism: Marxism|publisher = [[University of Cambridge]]|quote=The most notable spread of atheism was achieved through the success of the 1917 Russian Revolution, which brought the Marxist-Leninists to power. For the first time in history, atheism thus became the official ideology of a state.|year=2008|accessdate=July 17, 2014}}</ref> Under atheistic [[communism]] tens of millions of people were killed and many people were tortured (see: [[Atheism and Mass Murder|Atheism and mass murder]] and [[Atheistic communism and torture]]).  

The irreligious also have higher rates of domestic violence (see: [[Irreligion and domestic violence]]).  

The irreligious also have higher rates of [[domestic violence]] (see: [[Irreligion and domestic violence]]).  

In addition, there is the issue of excess alcohol usage and violence and irreligious societies have significant problems with alcoholism (see: [[Atheism and alcoholism]]).<ref name="pubs.niaaa.nih.gov">[http://pubs.niaaa.nih.gov/publications/aa38.htm Alcohol Alert, National Institute on Alcohol Abuse and Alcoholism No. 38 October 1997], National Institute of Health website</ref>  

In addition, there is the issue of excess alcohol usage and violence and irreligious societies have significant problems with alcoholism (see: [[Atheism and alcoholism]]).<ref name="pubs.niaaa.nih.gov">[http://pubs.niaaa.nih.gov/publications/aa38.htm Alcohol Alert, National Institute on Alcohol Abuse and Alcoholism No. 38 October 1997], National Institute of Health website</ref>