A report that examines the sentences imposed on federal offenders from 1984 through the first six months of 1990, a time during which the federal Sentencing Guidelines were promulgated and numerous mandatory minimum sentencing statutes were enacted. The report presents an overview of sentencing for the whole population, as well as a detailed analysis of mandatory minimum drug offenders over time, including the proportion who are sentenced at or above the mandatory minimum term and the changing influence of a number of offense and offender characteristics, such as prior record, role in the offense, age, sex, and race.