On June 26, 2015, the Supreme Court held that the "residual phrase" of the Armed Career Criminal Act, which provides a five-year increase in imprisonment for crimes involving conduct that presents a serious risk of physical injury, is unconstitutional. This decision was announced in the case of Johnson v. United States.
All crimes charged in federal court are governed by the United States Sentencing Guidelines ("guidelines"). These guidelines are created by the United States Sentencing Commission, which was created by Congress in the 1980's. The Guidelines were created in an attempt to equalize the wide disparity of sentences of similarly situated offenders.