Don't see anything in the definition of "activist" that includes fraud or fugitives.
After entering the country illegally twice, she became an activist shortly after she was arrested in 2002 during a federal sweep at O'Hare International Airport, where Arellano cleaned airplanes. She was later convicted of using a fake Social Security card.
Oh, you become an activist after you're arrested. Gotcha.
I'll have to do more research after work, but I don't think any of the "activism" has been directed at checking the identity and residency status of airport workers.