decapitate

verb
1
to cut off somebody’s head
سر بریدن, گردن زدن, سر از بدن جدا کردن
synonym behead
2
to reduce the power of a group or organization by removing its leaders
بی‌رهبر کردن, حذف رهبر, از میان برداشتن رهبر, نابود کردن تیم رهبری
Decapitating the regime led to years of chaos.
The party has effectively been decapitated.