purge
verbto remove people from an organization, often violently, because their opinions or activities are unacceptable to the people in power 清除，清洗（组织中的异己分子） - (formal)
to make yourself/somebody/something pure, healthy or clean by getting rid of bad thoughts or feelings 净化（心灵、风气等）；涤荡（污秽）
Word OriginMiddle English (in the legal sense ‘clear oneself of a charge’): from Old French purgier, from Latin purgare ‘purify’, from purus ‘pure’.