I am thinking about creating the impression that I work for Immigration and Naturalization Service, maybe get a hat with that ID on it, and make inferences in our conversations.
If you suspect there are illegal aliens being harbored there you have every right, and a duty, to call ICE on them. I think there might be illegal aliens there myself.
Let your imagination run wild as to how you can make their stay uncomfortable without putting yourself in any kind of jeopardy. Just don’t get caught doing anything illegal.
I did something like that a few years ago riding the bus thru Santa Ana, sat in the back of the bus with a drak green shirt on with dark sunglasses, made many people either not get on the bus or get off at the next stop. Did the for a few weeks.