If the cops grab you at a protest remember:
1) Ask "am I free to go?" if they say yes, GO.
2) if they say no, say "I am invoking my right to an attorney and my 5th amendment right to remain silent" then SHUT UP. wait for your lawyer.
Criminal defense attorney here! I’d only add - don’t mouth off, don’t escalate, don’t resist. Cops will be itching to add charges, don’t make it easy for the bastards.