I am sorry you are going through this!!! I understand how terrifying aggressive and violent neighbours can be. Please, if you can, get a security camera or something that you can set up to give yourself evidence in case anything happens; you will have such good proof it will make them accountable for their actions. If you can, record them with your phone (you can do it secretly / pretend to be on the phone) if it is safe for you. No matter what, get visual proof and/or witnesses. I am going through legal battles as well with a neighbour and this is what I am doing. It's been very difficult to even have to try to get this set up, but I feel so much more secure now and am getting evidence to prosecute them!
I don't know what country you are in, but if you have wifi, get one that can automatically help upload to the cloud or a server to save the data and you can use it. I currently use a Reolink as I like to just have it linked with ethernet, not wifi, and it has its own app so you don't have to pay for subscription cloud services. But if you want it easier to hook up to wifi, like the Tapo series from TP-Link, are really cheap; in Australia, some are only around $30-$50, which if you're in the US would only be around $20-$30.
Please also definitely notify the police just so you have a paper trail and record of having notified them, and it will help build up a case and have your back in the future if you want to make further complaints. Don't feel like you are bothering the police; just know that you are protecting yourself first!! You can call up and say you want to make a report on a dangerous individual exhibiting dangerous behaviour, etc., and you want to keep the police in the loop in case it further escalates or maybe they will want to actually go around looking for that person too! You never know if maybe other people have reported them, so you adding more reports gives the police more leverage and reason to take them in.
You can also go to a counsellor/therapist/doctor, etc., just so they have a paper trail of what you've been through and can corroborate the actions of those people that have impacted your mental health and wellbeing.
But yes, am praying for you in Jesus' mighty name! Jesus is a God of justice! Pure and holy! And he abhors evil and injustice. So know Jesus has got your back and wants the best for you! You deserve to be safe and not living in fear!!!
I pray Jesus protects and cloaks you completely, I pray he gives you the strength to do what you need to, I pray Jesus gives you insight, wisdom, and helps you feel strong in Him to do what is needed. Jesus is our strength, our fortress, and everything; he gives the breath in our lungs and helps us in everything down to the minuscule. He is such an awesome father and God, and may he have his hand over you in every way. May you know God's strength, and I pray that you know he gave you authority to trample over all evil, yes!! Luke 10:19: "I have given you power to tread serpents and scorpions underfoot, and to trample on all the power of the Enemy; and in no case shall anything do you harm." And what a good reminder also: "But don’t rejoice because evil spirits obey you; rejoice because your names are registered in heaven.” Victory in the name of Jesus!!!
Prayer Focus: God, Thank You for loving me. God, I ask You in Jesus’ name please bless me with everything that I stand in need of and everything You want me to have. 
