How many illegal immigrants are hired in public schools, banking, politics, and transportation (airlines)?

There are numerous illegals at Ronald Reagan. All of the major banks and fast food services are staffed by immigrants, and I have seen many in some very prominent government offices as well. Look at capitol hill (roughly 55% of the receptionists/secretaries are male Hispanic), these were once jobs held by other minorities. Department stores such as Macy's are just as suspect.