Wordnet 3.0
NOUN (1)
1.
the foreman of a work gang;
The Collaborative International Dictionary of English v.0.48:
Ganger \Gang"er\, n.
One who oversees a gang of workmen. [R.] --Mayhew.
[1913 Webster]
WordNet (r) 3.0 (2006):
ganger
n 1: the foreman of a work gang