The subjects were 1,466 male inmates released from supervision between 1973 and 1976. Demographic data were collected for each subject, and each former inmate's disciplinary history was recorded. The disciplinary infraction rates of long-term inmates were significantly lower than those of short-term prisoners, even during early years of confinement. The types of infractions committed by subjects in the two groups were similar; however, long-term subjects committed more serious violations. Older prisoners tended to commit fewer offenses. Short-term prisoners committed the greatest number of offenses during the middle of their sentences; offenses among long-term inmates were spread over the course of their sentences. Tabular data, a graph, notes, and 24 references are included.