DO NOT trust this horse one inch. NEVER turn your back, never take your eye off him (and whatever you do, do not let any kids near him!). Always be mindful of his body language and where you are in relation to him - you really do have to be on constant alert. If you're feeling a bit distracted, do not interact with him.
Saddlebag is 100% correct. Control the feet and you control the horse. Drive him away, keep driving him away. I use a buggy whip - long enough to keep me at a safe distance, short enough to not be unwieldy. Yelling doesn't work but I hiss like a snake and put myself in a "threatening" stance as well - makes me look like a bit of a loony but it sure does get a horse's attention, especially if (like mine) he's a bit insensitive to even a good crack with the whip. If you're the one that feeds him, make sure he isn't allowed to eat until you let him - drive him away from both you and the feed area, make him go stand in the opposite corner until you have put out the feed and stepped away from it. This will be particularly hairy as he will challenge you but the most important thing is NEVER take a step back. Any ground conceded is a win for him and he will become even worse.
These types of horses are a real battle but it is so satisfying when they become well-mannered and stand when you require it, follow when you want them to, back up when you ask for it and never pull a mean face.
Stay safe, I agree with the Clint Anderson tip and also check out John O'Leary's Horse Problems Australia - this page
is of particular use but all the ground manners stuff is helpful (as is plenty of his other stuff).
Oh, and this is one of those horses who you don't hand-feed treats. If you really want to make yourself feel good and reward him for some good work or after a day's hard labour, pop a piece of liquorice or some carrot or apple in his feed at feeding time.