a member of a political group who joins another party or group with the intention, often secret, of changing its principles and plans

He was seen as a far-left entryist. 他被视为极左的内奸。

She is an entryist and the leader of an ultra-right faction. 她是一个渗透者，也是极右团体的领袖。

involving the process or policy of members of a political group joining another party or group with the intention, often secret, of changing its principles and plans

entryist tactics 渗透战术

The group was never an entryist party-within-a-party. 该组织从来都不是一个混进来的党中党。