Tenant of Duplex Disorderly and Threatening Towards other Tenants who called Police

[Corey Meyer]

In our lease agreement, tenant agrees to keep premise clean, safe and in a habitable condition.  Neither tenant or their invitees shall be a nuisance or act in any matter that would interfere with the quiet enjoyment of adjacent tenants or property owners.  This prohibition includes but is not limited to, loud noises, loud music, noxious or unpleasant orders and disruptive behavior or actions. 

The tenant has now had a track record of having disruptive behavior/actions more than once to neighboring tenants in the same building and made them feel so unsafe they called the police.  

How quickly can I give notice to tenant that they must leave?  Do I need to give them a 30-days notice if they have a violation of our contract?  I will need to read up on Montana law for this, but my assumption is I don't need to give 30-days notice if the tenant breeched the contract making it void due to their breaking the agreement by interfering with the quiet enjoyment of neighboring tenants/ property owners. 

Thanks,

Corey