capo

noun

a clamp fastened across all the strings of a fretted musical instrument to raise their tuning by a chosen amount.

late 19th century: from Italian capo tasto, literally ‘head stop’.

1. the head of a crime syndicate, especially the Mafia, or a branch of one.

   the Sicilian capo claims he controls most of the world's heroin trade

1950s: Italian, from Latin caput ‘head’.