In the 80s they raided firms in the San Fernando valley on a regular basis, some at the time that we were doing conswtruction work on.
They loaded by vans and buses on a daily basis with them in Oceanside.
They rode the train from Oceanside to San Clemente and tie wrapped them for a bus trip back to Mexico.
They loaded them up on a daily basis at Lindburg that tried to go north by airline.
There weren't any illegals working in construction, at least in commercial until after 87.
You didn't notice it in Orange County back then since most didn't get that far.
Don't know about the tie-wrapping, but I've been on trains out of San Diego when they were stopped. Guy in my car had his nose buried in a newspaper when they tapped him on the shoulder and escorted him off.