There are millions of undocumented workers in the US using fake identities to get jobs. Both major parties support this system. Some Republican interests enjoy the access to dirt-cheap labor. Some Democratic interests want immigrants to be able to find jobs despite it being illegal to employ them. So we end up with a system where employers have no easy way to verify that an employee is who they say they are and has a…
The Uniparty doesn't even require collusion, although it's not exclusive of it. Both parties can effectively collaborate against the interests of their voters through confluence of different interests sharing the same technique. At the same time, there's no way either isn't completely aware of what the other is doing.
What perpetuates this particular issue is that both sides of the Uniparty, for all intents and purposes, represent the same class of citizen whose interests are so divorced from the voters that even the petite bourgeoise isn't in on it since they are the ones whose best interest is to comply with the system as opposed to subvert it. That is unless they want to risk having the fist of God slamming down on their business for a quick buck. The only way I can see the Uniparty destabilizing is if they represented different economic classes. At best, they pretend to, but fewer and fewer people are buying that story anymore.