You need cameras, and now.
Video record everything, call the cops and file police reports when things happen. I've helped a good friend go down this same path with cameras and filing police reports against HOA twats, and it's amazing how fast they give up when you have video footage of their antics and the police come visiting to say "WTF is wrong with you"...
HOA's are of the devil, and this kind of crap is exactly why I will NEVER own a house in an HOA/covenant controlled neighborhood.
No, there isn't one good thing about HOA's.