Federal prosecutors are investigating possible minority-contracting fraud involving a series of Chicago government contracts worth hundreds of millions of dollars, including many with ties to a clout-heavy trucking and recycling company owner, according to sources and documents obtained by the Tribune.

       The U.S. attorney’s office last month issued federal grand jury subpoenas to several city agencies seeking copies of contracts, bid packages, payment and payroll records as well as compliance documents for the city’s set-aside program for women and minority businesses.

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       The ongoing investigation is targeting possible fraud in the minority-owned business programs in the city of Chicago and other municipalities, sources with knowledge of the probe told the Tribune.