HENCHMAN
confederate, collaborator, henchman, partner in crime
(noun) someone who assists in a plot
Source: WordNet® 3.1
Etymology
Noun
henchman (plural henchmen)
A loyal and trusted follower or subordinate.
Synonym: Thesaurus:loyal follower
A person who supports a political figure chiefly out of selfish interests.
An assistant member of a criminal gang.
(obsolete) A page to a prince or other person of high rank.
Source: Wiktionary
Hench"man, n.; pl. -men. Etym: [OE. hencheman, henxman; prob. fr. OE.
& AS. hengest horse + E. man, and meaning, a groom. AS. hengest is
akin to D. & G. hengst stallion, OHG. hengist horse, gelding.]
Definition: An attendant; a servant; a follower. Now chiefly used as a
political cant term.
Source: Webster’s Unabridged Dictionary 1913 Edition