HOA Homefront: How do you handle a disruptor who’s also a director?

Q: I’m currently on my HOA board. The president is constantly rude, slandering other board members and basically being disrespectful. I am wondering what course of action a fellow board member has to get him under control. This is really uncomfortable and a hard issue to deal with and he is just being a tyrant. Any advice would be great. — J.E, Rancho Cucamonga.
Q: What can be done about a board member who repeatedly shouts down speakers during open forum? — R.M., Cardiff