The govt contract with them should be voided. That's the way.
But in the US no one believes they can meaningfully influence govt for real issues. And they are right.
Sure you can get them to paint a rainbow zebra crossing. /s
But not stop/prevent a (civil) war. Democracy dies and lobbyism (what we call corruption in "modern western democracies" -- because we dont do corruption, that's for poor countries!) takes over when the power is consolidated at a high enough level.
In the meantime, between now and the elections, what is a good method for deterring tech people from working for ICE? They are administering an authoritarian state today.