It's the Trade Union tribute to Connolly, who should be better honoured for his work in organising the Irish Transport and General Workers. I think it was in the T&GWU song book at one time. That may give you a clue where to look for the full text.
I can vaguely recall one stanza/verse :-
"In Dublin in 1913, in the Great Transport Strike, He fought the Dublin Bosses and he faught them with his might
Singing Connelly, he was there, Connelly he was there,
Brave but then undaunted, Oh James Connolly he was there"
Brennan on the Moor was the tune I remember singing it to.