A government crackdown on employing illegal immigrants is stepping into high gear this fall, opening yet another front in the compliance battles Corporate America must fight.

After years of pursuing undocumented workers, the Obama Administration has shifted its enforcement focus to the businesses that hire them. U.S. Immigration and Customs Enforcement, a unit of the Department of Homeland Security, issued 652 notices of inspection to U.S. companies in July—more than ICE issued in all of last year. Homeland Security officials say those audits will continue to increase both in number and in scale. ICE is also getting more money to fund its operations, including $34 million designated for worksite enforcement against illegal immigration.

Jaclyn Jaeger is a freelance contributor to Compliance Week after working for the company for 15 years. She writes on a wide variety of topics, including ethics and compliance, risk management, legal,...