That was with only 2,668 searches in one year. Most likely not. That's 6.5 million people out of work. Approximately 3 to 4 million out of 260 million U.S. residents are illegal. Of course those with leftist affiliations would have to be kept in check.
Danger is always present when the government stockpiles information on people.
Just ask the Japanese-Americans after Pearl Harbor. The government used U.S. Census Bureau information to distinguish city blocks where the Japanese lived. They were rounded up and thrown into prison camps. One can easily see the problems in allowing the government to have control over who works and who doesn't. It is very conceivable that the government would want to punish those it finds fault with.