Can someone help me understand ICE situation?

Apparently ICE protestors in Minneapolis are creating blockades in the streets and checking credentials and license plates to make sure cars aren't ICE vehicles.

So the protestors against Immigration and Customs Enforcement are building borders and harassing people to make them show paperwork to prove whether they should be allowed in the area. All without "due process"

And these are the folks calling ICE fascists.

Can someone help me understand ICE situation?
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