In history, religion and political science, a purge is a position removal or execution of people who are considered undesirable by those in power from a government, another organization, their team leaders, or society as a whole. A group undertaking such an effort is labeled as purging itself. Purges can be either nonviolent or violent, with the former often resolved by the simple removal of those who have been purged from office, and the latter often resolved by the imprisonment, exile, or murder of those who have been purged. The Shanghai massacre of 1927 and the Night of the Long Knives of 1934, in which the leader of a political party turns against a particular section or group within the party and kills its members, are commonly called "purges" while mass expulsions on grounds of racism and xenophobia, such as the deportation of the Crimean Tatars are not. Though sudden and violent purges are notable, most purges do not involve immediate execution or imprisonment, for example the periodic massive purges of the Communist Party of Czechoslovakia on grounds of apathy or dereliction, or the purge of Jews and political dissenters from the German Civil Service in 1933–1934. Chairman Mao Zedong and his associates purged much of the Chinese Communist Party's leadership, including the head of state, President Liu Shaoqi and the then-Secretary-General, Deng Xiaoping, beginning in 1966 as part of the Cultural Revolution. In Maoist states, sentences usually involved hard labor in laogai camps and executions. Deng Xiaoping acquired a reputation for returning to power after he had been purged several times. Pride's Purge The earliest use of the term dates back to the English Civil War's Pride's Purge. In 1648–1650, the moderate members of the English Long Parliament were purged by the New Model Army. The Parliament of England would suffer subsequent purges under Oliver Cromwell's Commonwealth of England including the purge of the entire House of Lords. Counter-revolutionaries such as royalists were purged as well as more radical revolutionaries such as the Levellers.