The head of a nonprofit that kicked back city grant money to former D.C. Councilman Harry Thomas Jr. pleaded guilty in federal court Friday and has agreed to cooperate with prosecutors on taking down others involved in the scandal.

Marshall Banks, a 71-year-old Howard University professor, pleaded guilty to one charge of “misprison of felony,” which is a charge related to stealing via programs that receive federal funds. Banks headed up the nonprofit Langston 21st Century Foundation, a nonprofit Thomas used to funnel city grant money meant for kids to his own wallet, according to prosecutors.