首謀しゅぼうしゃ
shu bōsha

Noun

1. ringleader; mastermind; leader (of a plot)

かれらはかれをその殺人さつじん事件じけん首謀しゅぼうしゃだとかんがえた。
karerawa kareo sono satsujinjikenno shubōshadato kangaeta.
They regarded him as the ringleader of the murder case.
Other forms: