Minn. Stat. § 241.20

Whenever the commissioner of corrections deems it conducive to the rehabilitation of inmates of correctional institutions under the commissioner's control the commissioner may use selected inmates in the general improvement, maintenance, conservation, reforestation, soil erosion control, soil rehabilitation, and cultivation of any land within the control of the commissioner and, pursuant to agreement with the head of any other state department or agency, of lands under control of such department or agency.