ICE raid is taking place in Denver, Colorado

ICE raid is taking place in Denver, Colorado and a woman appears with a megaphone

She instructs the illegals, “You have the right to remain silent, You don't have to open the door. Do open the door without an order signed by a judge with the address and the specific person”

How did this person know this raid was going to take place and have a megaphone ready at this exact location??