The wildest part is that a group of people could literally just buy an unmarked van, wear all black, have some handcuffs and tasers, and kidnap literally whoever they want while screaming "ICE!"
Nobody would know the difference. TBH, I don't think ICE would know the difference, because I don't think they're keeping track of the people they're kidnapping.
Remember how they kidnapped like 10,000 kids but "forgot" to keep records of where they put them?