How do I stop my boxer/husky mix from chewing my things while running circles around me and snarling?

I recently adopted a 1 yr old boxer/husky mix. He is a huge handful but I expected that for a "teenager" who's been in shelters since he was just a couple months old. The main issues right now are the facts that constantly all day long he will walk around looking for something he's not supposed to have. He then snatches it, looks at me and starts running back and forth and in circles like a lunatic while he destroys it, snarling and snapping at me when I try to get near him to take it away. Even if I do manage to get ahold of him, he will not let the thing go, by the time I get whatever it is, it is decimated. He does this at LEAST 5 times a day. He has plenty of his own toys and I walk him at least 2-3 times a day. He also bites...not aggressively, but if he gets overexcited, which is often, or when you touch him when he doesn't want you to, he'll nip you, and also tries to mouth on you in general. Oh, and also he humps everyone except (usually) me, especially my husband, and he bites during that too, again not really too hard, but it's a bit unnerving. It's also extremely difficult to get him off someone once he gets those boxer front legs and paws wrapped around them, and he will keep going back and back, getting more frenzied until I physically separate him from the person, put him in another room and make him stay until he's laying down and calm. Help!