The Manchester United Supporters Trust (MUST) has called on the UK Government to act to private shareholders holding majority ownerships in football clubs.
United's Premier League clash with Liverpool was postponed after fans broke into Old Trafford in protest against the Glazer family.
The Red Devils were among 12 clubs that last month signed up for the breakaway European Super League, which collapsed with 48 hours.
"What we witnessed at Old Trafford today is the culmination of 16 years since the Glazer family's acquisition of the club," said a MUST statement.
"Over that period, the owners have taken £1bn out of the club and we have witnessed decay and decline both on the field and off it.
"The Government now needs to act. That has to mean a process which results in fans having the opportunity to buy shares in their club and more to the point no single private shareholder holding a majority ownership of our football clubs which allows them to abuse that ownership.
"The Government needs to reflect the views of ordinary people who see that now is the time to reclaim the people's game."