Frustrated Manchester United supporters took their anger out on Sir Alex Ferguson after Tuesday's 3-0 defeat to Manchester City.
After the match, angry fans yelled expletives at the former United manager as well as David Moyes, his handpicked successor, according to multiple reports.
Stadium stewards also had to be deployed to prevent supporters from tearing down a banner honouring Moyes as "The Chosen One."
Ferguson retired last season and chose Moyes to take over the club that he led to 13 Premier League titles in 26 season.
United are currently in seventh with 51 points, and an emphatic defeat to their cross-town rivals -- their 10th league loss of the season -- was apparently too much for some fans to take.
Tuesday's defeat ensured United will finish with their lowest point total of the Premier League era.
Stewards had to pull one fan away from Moyes' seat in the dug-out, according to The Telegraph.
Moyes took the blame for Tuesday's loss.
"I take responsibility," Moyes said. "I have to be the one who plays them, picks them and that is what it is. I don’t think tonight was in any way [down to] a lack of effort or lack of commitment from the players, in fact I thought they were fully there but in some areas we didn’t come up to scratch."