The Detroit Public School Board voted Monday to sue the system’s financial manager over what it termed unlawful private compensation in his contract, reports The Detroit News.

Robert Bobb is set to receive $145,000 this year in supplemental income from nonprofit groups, including the Broad Foundation. A lawyer representing Detroit teachers and activist groups said the deal represents a conflict of interest and violates state ethics laws that prohibit public officials from accepting gifts that could influence how they perform their duties.

Mr. Bobb is a 2005 graduate of the Broad Foundation’s training program for education executives. The organization’s support of charter schools has made it a controversial player on the Detroit schools scene.