need more details and a clearer more cohesive question.
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Your belief would support a notion that the tenant allowing other persons (felons recently released, or otherwise) in the apartment is in violation of the occupancy agreement and is subject to either administrative proceedings for a lease violation and termination and or to a direct lawsuit for eviction in Housing Court.
The penalties are extreme for a tenant caught in the wrong.
Read the information at the link:
If your interest is a safe building and you know of a condition that may be dangerous due to a tenant's behavior, do you feel comfortable passing this information on by yourself, or believe you need an attorney to do so?
The answer provided to you is in the nature of general information. The general proposition being that you should try to avoid a bad outcome if you can.