"We had a pivotal moment a few years ago when my players surrounded Andy D'Urso, " said Ferguson.
BBC: Ferguson urges referees respect
2.
In 2000 his side were involved in an infamous incident when they chased and surrounded referee Andy D'Urso after he awarded Middlesbrough a debatable penalty.
BBC: Ferguson urges referees respect
3.
The Cardiff striker's long-range strike appeared to come back off the underside of the bar but referee Andy D'Urso judged the ball had crossed the line.