Through their abuse and deprivation of rights, DHS is forcing detainees to sign self-deportation papers without legal counsel and without it being in their language, so they have no clue what they are signing.
Between the national protests, there are lots of local activities that you can be involved in, as well as other related activist groups who organize their own anti-Trump actions.
ACAB (All Cops Are Bastards) is a group focused on leaks, hacks, and news about police and federal agencies who are acting beyond the bounds of the United States Constitution.