entryist       
 noun [ C ] UK uk/ˈen.tri.ɪst/ us/ˈen.tri.ɪst/
 打入内部者,内奸
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。 
 See: entryism
 - More examples
 - She should not be seen as an entryist, but as proof that allegiance no longer matters.
 - I thought that he might be some kind of right-wing entryist.
 - An entryist targeted the group, and the leadership mounted a strong campaign on his behalf.
 
entryist       
adjective UK uk/ˈen.tri.ɪst/ us/ˈen.tri.ɪst/
 混入内部的,内奸的
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。 
 See: entryism
 - More examples
 - They tried to work their entryist charms on the direct action movement.
 - Their moderation was a mask for entryist tactics.
 - They are acting almost as an entryist organization, placing people within the political parties.