Correct

异己

/ yìjǐ / 
Strokes

Definition

dissident/alien/outsider

Example

As a Noun

dissident; alien

1
Yìjǐfènzǐ
异己分子

dissident; alien element

2
Páichúyìjǐ
排除异己

exclude/discriminate against those who hold different views; get rid of dissidents

3
Dǎjī
打击
yìjǐ
异己

crack down on the dissidents

4
Chǎnchú
铲除
yìjǐ
异己

wipe out/get rid of dissidents