Host Hotels & Resorts Inc., which owns the Marriott and funded the renovation, has said it was unaware of any potential labor violations until January, when State Police arrived at the hotel and began interviewing the Victory Outreach workers.

But the findings by labor investigators show the violations extended far beyond those involving the church’s workers and involved an array of construction companies that employed a shadow workforce at the Back Bay hotel for months....

Even if the state finds violations by multiple subcontractors it cannot identify them because state law protects the privacy of companies accused of tax violations. That means none of the 15 companies it found to be acting illegally at the Marriott will be known to the public.

Meanwhile, the volume of violations being discovered at Massachusetts work sites continues to increase.

In 2011, the state task force on the underground economy collected nearly $11 million in fines, back taxes, and unpaid wages from companies found in violation of labor laws....

The violations were found in a range of industries, including food service, information technology, and construction....

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