To purge an organization of its unacceptable members means to remove them from it. You can also talk about purging people from an organization. (从组织中) 清除 (异己成员)
verb [vt. 及物动词]清洗;净化
The leadership voted to purge the party of "hostile and antiparty elements." 领导层投票来清除党内“有敌意的反党分子”。
adjective [原级]涤罪的
Consider, for example, the purging of data. 以数据清除为例,我们来考虑一下这个问题。