If you acquire a property through a foreclosure sale and the former owner or tenants do not leave, you will need to take legal action to evict them. The process for evicting a tenant or former owner from a foreclosed property can vary depending on state laws and the specific circumstances of the case.

Here are some steps you can take to evict a tenant or former owner from a foreclosed property:

1. Serve an eviction notice: In most states, you will need to serve the tenant or former owner with a written eviction notice. The eviction notice must inform them of the reason for the eviction and the date by which they must vacate the property.
2. File an eviction lawsuit: If the tenant or former owner does not vacate the property by the date specified in the eviction notice, you will need to file an eviction lawsuit in court.
3. Attend the court hearing: If the tenant or former owner contests the eviction, you will need to attend a court hearing to present your case. The court will decide whether to grant the eviction.
4. Obtain a writ of possession: If the court grants the eviction, you will need to obtain a writ of possession. This is a court order directing the tenant or former owner to vacate the property.
5. Enforce the writ of possession: If the tenant or former owner does not vacate the property after being served with the writ of possession, you may need to hire a law enforcement officer to physically remove them from the property.

It is important to note that the eviction process can be complex and time-consuming. You may want to consider seeking legal assistance to help you navigate the process.