Matthew Foster, who leads on immigration in the West Midlands, said illegal working was undercutting legitimate businesses and allowing vulnerable people to be exploited.
“Those who choose to break the law by working illegally or employing illegal workers should expect to be caught and face the consequences,” he said.
The enforcement activity comes after ministers promised to get tough on illegal migration to “protect UK borders”.
Plans have included a focus on food delivery companies such as Deliveroo, Uber Eats and Just Eat to prevent illegal working.
In June, the companies agreed to strengthen security checks following reports some asylum seekers were working illegally as couriers.