Bullies...

Well... We have a little drama going on and I'm not sure how to handle this anymore!
A few years a go, some renters moved into the house behind ours. A woman, her son (2yrs. older than Noah) and her boyfriend. Everything was fine until the son wanted to play with Noah. OK, great. Something felt weird right off the bat with this child. I couldn't put my finger on it. So as time went on I soon realised that this child is not someone I wanted Noah playing with.
Here's the list:
1. I stopped him from throwing a brick at another child's head who was riding a bike.
2.He was throwing M&M's at passing cars and a lady stopped to tell me about my son's behavior. I called Noah out and she said oh not him, the bigger child did it. Oh the one running home, slamming his door!
3. I caught him lighting dry leaves on fire next to my garage, his mother seemed un-interested.
4. Swears like a truck driver
5. Lies
6. Steals from the neighborhood children
7. Is very passive aggressive.
8. Pulled a big butcher knife out and threaten Noah and another boy with it. (His mom ran in the house and wouldn't answer the door when she saw me coming over about it.) Another mom had called her on the phone. No punishment was giving to the son.
9. Bullies Noah anytime he finds Noah alone. Tried to shove Noah into the street once.
Now the problem with the mom and boyfriend.
1. They could care less about his behavior. They won't answer the door when you try to confront them.
2. Had the police storm their house twice in the year they lived there. For drugs.
3. Never let other children in their house but wants their son to play elsewhere.
4. Loud and rude.
OK, so they were evicted late last summer, they only moved three blocks away. They abandoned a very sweet cat named Bob who we took care, litter trained and found him a good home. Then I find out from the house's owner that they left 4 more cats in his house with no food or water. Not to mention they owed him thousands of dollars.
Now this boy found out that we were taking in bob and was so mad. (even though they left him to fend for himself) that's when he really started to bully Noah. He told Noah that his mom gave him permission to punch Noah in the face! Noah said to him "Go ahead, but I'll punch you back" (He didn't punch Noah).
This boy happens to play sometime with one of Noah's best friends a few house down from us. Now Noah's friend's father is a pastor and they are very sweet people. They tell Noah to forgive this boy. OK.... fine. Noah has forgiving over and over. But I put my foot down and said No more! He's too dangerous to play with. Oh the knife incident happened at their house! They still that that kid come over! So I told Noah if the kid comes over to his friends and Noah is there, Noah is to come straight home!!!! So that's what he does. Fast forward to the 4th of July......
Brad took Noah to a store to buy the fireworks and this kid and the "boyfriend" was there. The boyfriend said in the store,"Look there's Noah the brat". Brad didn't hear this but Noah did. Then in the parking lot the guy approaches Brad and says: "Hey do me a favor and tell Noah to stop telling everyone "A" tried to burn your garage down!" Brad said Well I'll talk to him, Noah
said I only told one person (his friend) that "A" could of burned down our garage. The man then proceeds to call Noah a little Bastard. Brad told him to stop talking to Noah or else! and some other choice words were exchanged. They came home and were both very upset. Noah felt sick to his stomach over this. I tried my best to calm him and just carry on with our plans. When we got home from the fireworks, we were in the front yard. Brad was ready to light a firework. The guy drives around our corner and yells: "Asshole!" to Brad. Of course with my hot Sicilian blood I spouted off something I would usually not say! He does not need to drive around our corner to get to his house. Whew...... Now my problem is what should I do? Should I ban Noah from his best friends house?, talk to his best friends parents?, (they have no clue about the drug bust) I didn't feel it was my place to blab it all over the neighborhood. Now I am on the Internet. oh well! How do you stop the bullying? Now the boyfriend a grown man, is bullying!
I hate this. We just want them to leave us alone. Now I understand why the son acts the way he does! What a great role model. The worst part is what it's doing to Noah , my sweet boy with the golden heart! Now he's seen his parents react to this idiot. And we probably didn't use the best judgement at the time. Ugh! Do you have any advise? I know confronting these people will not work, either they wouldn't answer the door or it would get really ugly, really fast! I'm very concerned for Noah safety and Brads. The boyfriend is a big, fat, butched haired, ghetto type!
Not to mention a drug dealer! yikes!!!

Note: Bullies...Isn't this one of my reasons not to send Noah to the Lansing Schools? He's a homeschooler being bullied for goodness sakes!

*****UPDATE: I talked with Noah's friend's mother yesterday. She was appalled by the boyfriend's behavior. She said she knew the boy doesn't have it easy and was trying to give him somewhere he could come to that a good environment, I told her that was wonderful! She said she will make sure the two's paths will not cross as best that she can. She said she limits this boy's time at her house and watches him carefully. If he shows up and Noah is there she will make the boy go home and call first to play some other time. That's the best I could ask for!