Manchester United manager Ole Gunnar Solskjaer has backed the right of fans to protest, but said they needed to be "civilised" after Sunday's breach of security at Old Trafford led to their Premier League game against Liverpool being postponed.
Protests from supporters against the Glazer family, which have taken place since they bought the club in 2005, have reignited since United's involvement in the botched attempt to create a breakaway European Super League.