The communists called these prison camps "reeducation camps". Postural thoracic kyphosis can often be treated with posture reeducation and focused strengthening exercises. The transformation process usually occurs in prisons, labor camps, reeducation centers and other detention facilities. Some were forced to work in concentration camps, others forcibly enrolled in Marxist reeducation programs. A campaign of propaganda, large-scale extrajudicial imprisonment, torture and coercive reeducation ensued. The reeducation camps are large prison building complexes surrounded by high walls. The OPMG began a formal reeducation program for German prisoners in fall 1943. Many were sent to the countryside to work in reeducation camps. None of the investigated monks were ever charged, although many were sent to reeducation camps. There are around 15 to 20 reeducation camps in North Korea. Witek and Birkut both seem to have been sentenced to prison terms and reeducation. Shujuan's youngest brother was also sent to a reeducation camp. One of the prostitutes, Xiaoe, attempts to hang herself in reeducation. Political reeducation also played a major role in Cuban penology.