The only reason this isn't already happening is because there are not yet enough people willing to defy the regime and/or shield those who do.
This is going to take more than just a few people, because the regime has power on their side.
People have to be willing to break the law and make sure others get away with breaking the law, before real change will happen.
If the tech workers REALLY want to stop ICE, as they proclaim, they would sabotage the machine.