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 would avail myself of the laws of the land, but wouldn’t trust ICE under Biden. It would more likely be me that got arrested for “hate bias.”