to get rid of people from an organization because you do not agree with them

Party leaders have undertaken to purge the party of extremists. 政党领袖已采取行动清除党内的极端分子。

Hard-liners are expected to be purged from the administration. 主张强硬路线的人预计将从政府中清除出去。

to get rid of something unwanted, harmful, or evil

Roman Catholics go to confession to purge their souls/themselves (from/of sin). 罗马天主教徒前去忏悔以净化灵魂／涤罪。

The new state governor has promised to purge the police force of corruption. 新州长已保证要清除警察队伍中的腐败现象。

the act of getting rid of people from an organization because you do not agree with them

Between 1934 and 1938, Stalin mounted a massive purge of the Communist Party, the government and the armed forces in the Soviet Union. 1934至1938年间，斯大林对苏联的共产党、政府和军队实行大清洗。