By law Abri Credit Union is a not-for-profit cooperative. Policy matters - then and now - are set by an unpaid board elected annually from the membership at large. Its initial membership was limited to employees of Argonne National Laboratory and Atomic Energy Commission, a predecessor today's Department of Energy. As time passed the credit union's field of membership was expanded to include the employees of other National Laboratories; as well as other smaller groups engaged in energy research and development.