Real question: Do landlords resort to "hired help" to encourage non-paying tenants to leave more quickly? Two years sounds crazy. Many people who only own a second home for rent might go bankrupt without rent to pay the loan.
In Poland, they sometimes do. For example, they rent the property to another person (they claim that it’s legal), who is a goon. The goon moves in with the original renter, and makes his life hell. Other paths are to disconnect electricity from the property, by cancelling the contract with electric provider. However, some people are ok with living without power, if the apartment is free. Next steps are - disconnecting water and/or heating, although these are less legal than disconnecting power.
There also was a tragic case of an older lady who resisted being evicted from a building in Warsaw bought by a new owner, who in turn kidnapped her, drove to city outskirts and burned her alive to get rid of her.
The eviction process itself takes about two years.