There is nothing more effective than a camera to disrupt undesirable activity. I have had two incidences with persistent skateboarders where a camera made them run like a light on vermin and not return...
Published/shared pictures and videos are powerful especially if it shows the American citizen facilitating illegal activities and the illegal alien. You know,
Make em Famous! I've always wondered how effective it would be to publish a local/regional/ or national magazine consisting of pictures of people picking-up and or working illegal aliens. Kinda like the prostitution pictures published to punish and embarrass the prostitution crowd.