The player is Harry Hood.
i think it was alex Ferguson while playing for st johnston
Bill Mosienko in 1952 against the New York Rangers.
Andrei Kanchelskis, scored for a hat-trick for MU v MC in 1994 in a 5-0 win, also scored 2 for Everton v Liverpool afterwards, then moved on to Rangers in 1998 where he scored against Celtic
Wayne Simmons. 2014 playoffs against the Rangers. I actually Googled this right after I saw it.
Andrei Kanchelskis scored a hattrick for Everton against Sheff Wed in the 95-96 season
I know at least Brad Stuart has scored a hat trick, I believe against the Wild...
No player has hat trick against manchester united