Rule E3 (1) A participant shall at all times act in the best interests of the game and shall not act in any manner which is improper or brings the game into disrepute,
A well-intentioned rule which is constantly abused by the FA. How well does the Rule lie with a person's right to freedom of speech? Allardyce is not being defamatory of the referee by suggesting that referee was dishonestly biased ( the words "in any manner which is improper", could , perhaps, be interpreted that way) but commenting on human nature. A recent report, mentioned in the press, from some university on home wins over the last 60 years or so showed that these were formerly much more common than in recent years. The deduction was that referees are better, and specifically, trained to resist the influence of the home crowd and overcome this natural tendency. However, the effect of a crowd baying for a decision could not be overlooked.
And the Rule has often been used in an attempt to gag 'participants' who would make any comment which the FA doesn't like. The words ' bring the game into disrepute' may have 'game' defined as the 'FA itself' or 'any official' or even 'any player or manager' and any criticism being held to be bringing the whole game into disrepute.