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United fans have regularly vented their frustrations at their American owners, who bought the club in 2005 when it was a PLC.
And after the club were one of the leading sides involved in plans for a breakaway European Super League, United supporters are again calling for the Glazer family to sell up.
Following on from small pockets of fans breaking into Carrington with flags this week, an organised protest outside Old Trafford saw thousands turn out to make a statement.
Those present chanted against the Glazers for around three hours, while an United States flag was burned in a strong statement that mirrored what we saw outside the Emirates on Friday night.
Many fellow fans on social media felt the gesture went too far:
United's executive vice-chairman Ed Woodward is another whose work United fans have not been pleased by and it's been confirmed that he will resign from his role at the end of 2021 as a result of the Super League fiasco.
Another protest against the Glazers is scheduled for the visit of Liverpool next week.
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