Have the other Denver or Colorado Springs agents on here confronted this?

Every landowner and property manager who believes that poor people need to exist and exist because of their own lack of agency or cleverness to navigating the economic system owes it to themselves to confront the history: https://video.kpbs.org/video/east-lake-meadows-full-film/

There are a plethora of issues that you could possibly be confronted with and so it is important to know your goals and not subject yourself to punishment for doing good deeds. 

You should do this in a professional non confrontational manner.

THEN everything hits the fan.HOA board member confronts the buyers at inspection, is INCREDIBLY rude and tried to get them to back out of the transaction. 

I have not confronted them about stealing.So I have their April rent, they were on month to month since they were going to move out anyway.

@Michael Delmont I would definitely confront your attorney.

They are Entrepreneurs, trying to do a good business, but the Tenants snuck in more people.When the Landlords confront the tenant and their extra sublets, it's always a sob story and the Landlord just tells them to pay a little extra for the increase in costs like Water Bills, etc.What sometimes happen is that the tenant then moves out and the Undocumented Workers stay, but continue to pay rent.That happened to a number of Landlords I know in Queens where this has devastated that community.The real issue is the Strong tenant laws and the sneaky tenants that allowed the situation to become so much worse for the Landlord.This doesn't happen in higher priced Apts.

Some win for the rent-strikers.TL;DR - The vast majority of landlords who might confront a rent-striker face the potential consequence of a temporary loss in income from some tenants, likely a small minority, something that they can usually weather for months.

If they are confrontational and refuse to work with you at all, then tack on your late fees, and tell them you will be filing for all rents, late fees, filing fees, and attorneys fees the second courts are open, and you will be getting a judgement against them, hit their credit, and garnish their wages going forward until you are made whole.