Posted elsewhere but belongs here too:
Protect your neighbors, friends, co-workers, or anybody else who might be deported. Give no information to ICE. Demand a judicial, not administrative, warrant before allowing ICE to enter your workplace, classroom or home.
Order or print "red cards" (
https://www.ilrc.org/red-cards-tarjetas-rojas) and leave a supply in areas where they might be of help or interest to immigrants (bodegas, community centers, etc.)
Contact your representatives to oppose these activities, and keep contacting them, even if you think they won't listen. If enough people complain, they will listen.
Don't get overwhelmed or discouraged. Demoralization is part of the strategy, so don't let it happen to you.