PFA chief executive Gordon Taylor feels supporters have to play their part in the much-trumpeted FA Respect campaign. Recent high-profile incidents at Villa Park and the Stadium of Light have placed a major question mark over supporter behaviour which Taylor is anxious to see improved.
"It is time to re-emphasise the Respect campaign," said Taylor.
"It is about the referee involving the captain to say things are getting out of hand, or even the manager.
"But it is not just about players and referees on the field, it is about people watching the game as well.
"Recently, we have had a number of crowd issues with people throwing things, some injuries and some nasty incidents. It is a problem and it needs to be stopped."