61 workers with disabilities at ORC were being paid subminimum wages as of Jan. 1.
The firing of three long-time employees at the co-op sparked a backlash and hints at deeper problems inside the organization.
Gundersen and Mayo received millions in federal help in July.
Mayo garnished $74,200 in wages from its own workers in La Crosse and Vernon counties in the last two years.
ORC Industries paid its president over $800k in 2018.