Update: No people at all hanging out smoking weed and threatening residents in front of the apartment building for over a week! The people are still here. Something definitely happened. As noted above I believe the landlord gave a final warning. But I also now believe that the police may have had some kind of contact with the tenants and landlord.

My anxiety is better now. I still get anxious coming back to the apartment complex property but it's not nearly as bad as it was even a few days ago. I can't say for certain that this is over but when compared to what was going on I would say there is good chance that it is. I said before that it should be over by Christmas. Well, it looks like it might be by Thanksgiving! I will update again if anything changes.

I would like to share some of what I learned from this situation that may be helpful to someone else in a similar situation:

In general, the landlord of a rental property holds the power to stop and/or remove illegal behavior and the police have the authoritative information (the proof) to allow the landlord to exercise their power legally. This is a powerful, effective combination. So document and report each incident early on to both, request confidentiality and make sure the police give the landlord a copy of the reports.