The rules concerning evictions, foreclosures and reposessions vary from state to state.

If you want to know "the rules" where you live, look up you state government's website and check the "civil code". All states have such a site.

Wherthe the people being trown out are rentors of former owners, the event is going to look about the same on the evening news.

Both are termed "adverse posession" which also includes squatters. Again, the exact laws are in your state's civil code.