Further to the queries above about gangers; in John Laing construction on civil engineering jobs in the early 60's you had foremen who normally had a number of gangers working under them. Each ganger ran a team of between half a dozen to a dozen men.

Gangers, in turn, were normally supervisors who worked alongside the men in their gang. There were also "walking gangers", who did not work beside the men, but who filled the position of a sort of junior foreman. A walking ganger might therefore supervise several groups of men, each group being supervised by a ganger who worked with them.