In 2015, after an investigation, the federal Department of Labor concluded that Sanitation Salvage owed workers $385,000 in unpaid overtime accumulated over the previous three years. Workers said the company installed what they called a sham union that served the interests of Sanitation Salvage’s owners. Records show the union was long run by mobster James Bernardone, identified by law enforcement as a soldier in the Genovese crime family. In 2013, the National Labor Relations Board found that Sanitation Salvage’s management unlawfully threatened to fire workers who opposed the union.

The BIC eventually suspended Sanitation Salvage’s license, saying the company posed “an imminent danger to life and property.” The agency cataloged an array of violations including undisclosed workers, unlicensed drivers, a majority of drivers pulling long shifts far exceeding federal regulations and 58 collisions over the last three years.

“This company has demonstrated time and time again that they value profit over the lives of New Yorkers and the well-being of their workers,” Mayor Bill de Blasio said in a statement at the time of the suspension in August.

Sanitation Salvage has not responded to detailed questions over many months. Sanitation Salvage said the claims of unpaid overtime were without merit, according to a Department of Labor Wage and Hour Division investigator’s report. The company refused to pay the $385,000, claiming the workers were seeking to be paid for time actually spent hanging out with friends. When the department chose not to take the company to court, the issue ended.

The union that represents Sanitation Salvage’s workers has not responded to requests for comment about its history with the company or the findings of the Department of Labor or the NLRB.

One person with knowledge of Sanitation Salvage’s recent operations said the company had lost as many as half of its customers after the suspension this fall. And just this week, the city’s public housing agency said it was moving to cancel contracts it had with the company.

Natalie Grybauskas, a spokesperson for the BIC, said in a short statement Tuesday night that the agency had received the letter from Sanitation Salvage and was working to make sure the company’s customers got their trash collected.