ringleader 〔匪徒的〕头目，首恶，魁首

bca

ringleader
ring·lead·er / ˈriŋliːdə(r) /
n.    (disapproving)a person who leads others in crime or in causing trouble
   罪魁；头目；元凶

ring∙lead∙er
/ ˈrɪŋˌlidə ; ˈrɪŋˌliːdə /
◙noun [C]
1. someone who leads a group that is doing something illegal or wrong
• 〔匪徒的〕头目，首恶，魁首:
»the ringleader of a new international drugs ring
  一个新的国际贩毒团伙的头目

ringleader
\ˈ ̷ ̷| ̷ ̷ ̷ ̷\ noun
Etymology: ring (I)(group) + leader
: a leader of a group of individuals engaged especially in violation of law or an improper enterprise
< one of the ringleaders of the abortive revolution — Ethel Drus >
< vengeful murder of the mutiny's bloodthirsty ringleader — F.R.Dulles >