a person whose opinions, especially about religion or politics, are extreme, and who may do things that are violent or illegal for what they believe极端主义者；极端分子；过激分子
connected with or belonging to people whose opinions, especially about religion or politics, are extreme, and who may do things that are violent or illegal for what they believe 极端主义者；极端分子；过激分子
extremist groups极端主义团体
violent extremist ideology暴力极端主义思想
The problem lies with the extremist elements in the party.问题在于党内的极端分子。