A city spokesman in a text message said Scott resigned Monday, and that it was effective immediately.

Contract awards are a significant focus of the federal investigation. The city's chief procurement officer, Adam Smith, pleaded guilty in 2017 to accepting bribes in exchange for steering city business to certain contractors. He is currently serving a 27-month prison sentence.

In addition, two former city contractors have pleaded guilty to paying bribes in exchange for lucrative contracts. A third contractor was indicted in February and is awaiting trial.

The contract compliance officer wields tremendous power in who is awarded contracts to all city departments including two of the biggest — the airport and watershed.

The office’s purpose is to “mitigate the effects of past and present discrimination against women and minority businesses,” according to the city’s website.

But the complex web of minority contracting requirements for the airport and other city departments have often been the subject of highly contentious lawsuits over who gets the work.

The city’s minority participation requirements include specific certifications, paperwork and employment percentage goals for disadvantaged groups. An industry of consultants has grown up around the programs to help bidders navigate the process.

Apart from the corruption investigation, the city in recent months has drawn the ire of Federal Aviation Administration officials, who are investigating the alleged improper use of airport funds to pay legal fees, including some related to the corruption probe.