DtG ~~ Not often I begin a post "In fairness to Jim": but feel I must point out that, as this is primarily a folk music forum, whatever %-ge of the population at large might be expected to have heard of Aunt Molly Jackson, and know the song "Which side are you on?", it was not unreasonable on his part to assume that a much higher proportion of denizens of this forum would have done so.
Mind you, that interpolated vocative 'boy' does not appear in the DT version of the song, which is attributed Florence Reese, 1946.