From 2002 comes this column about Linda Chavez. The column points out that she's a director of ABM Industries, Inc. (According to her bio, she still is).

ABM is a very large janitorial firm. Apparently they are or were very stringent about checking the legal status of their workers, and good for them. However, the column wonders whether that helps explain in part why she is more or less a cheap labor pimpette. It could be something else, of course.