[lazide]

Usually the dangerous folks are people on the payroll, and the end game is selling the property to someone else to be turned into something higher end once the normal tenants are out.

Sometimes it’s just to have tenant churn to allow them to get higher rents. Rent control for long periods of time can cause very large disparities between current market rents and what a tenant is paying (thousands/mo). The dangerous folks aren’t usually obvious when first checking out a unit.

At least in NYC, there is a lot of reputed Mafia involvement in real estate.