“As researchers, probation and parole officials, and criminal justice reform advocates from across the country have made clear over the past several years, the number of people on probation and parole –collectively referred to as community corrections or community supervision – has far exceeded its original intent. Supervised populations skyrocketed from the late Twentieth Century to their peak in 2007, at which time over 4.3 million people were on probation and another 800,000 were on parole”