A individual's greatest enemy appears to be their own national government. One source estimates that "Nearly 170 million people probably have been murdered by governments in this [20th] century; over four-times those killed in combat in all international and domestic wars during the same years." 3Mass murder and genocide in recent years have involved:The execution of individuals who have simply decided to change their religion,Mass murder of followers of a minority religion by members of a dominant religion,Mass murder of followers of one faith group by others of the same religion.Mass murder and genocide of an identifiable group for a variety of reasons.It appears that:The persecution and mass murder of European Jews by Christians from 306 to 1945 CE was the longest lasting mass crime against humanity The mass murder by the communist government of the USSR of 20 or more million of its citizens (1917 to 1987), and by the communist government of China of about 35 million of its citizens  (1949 to 1987) probably involved the greatest loss of life. It is difficult to be certain because accurate data is impossible to obtain. Governments normally do not publish figures for the number of their citizens that they murder. One of the main motivations for the creation of the United Nations in 1945 was to prevent future mass crimes against humanity and genocides. In this role, the UN has not done well. As of early 2012, governments continue committing or allowing mass crimes against humanity including the victimization of:Aboriginals, Christians, and Muslims in Sudan. Roma throughout parts of EuropeFinally, the democratic government of Uganda is considering a bill to legalize he judicial genocide of gays, lesbians and bisexuals who engage in same-sex sexual behavior.And few people seem to care.