A few years ago I worked with an arrogant tit. I now find myself in a situation where I am the Chair of a voluntary organisation (let's call it Friends Of the Nature Reserve) of which he is a member, and he is behaving like an arrogant tit. He makes unilateral decisions, like booking rooms for meetings without asking anyone else, and makes unfounded pronouncements - like saying that community groups can't get bank accounts. I've had to establish formal procedures (writing a constitution, appointing a secretary and treasurer, etc) so that there's something in writing to say he can't go off on his own bat and spend money or make decisions without agreement.
We're in a stand-off at present because he wants everyone to put their details on a google form. I won't consent to have my contact details stored in that way and don't want to have to require it from everyone else. Besides, if he's got access to everyone's contact details, there's no saying what he might do. He is getting huffy. WWYD?