The Constitution requires the federal government to obtain an indictment and jury verdict before imprisoning a person. While on federal supervised release Frederick Calhoun entered an Alford plea to a state charge. The state court imposed no prison time. The federal court, however, (without indictment or jury verdict), revoked the supervised release and imposed an 4 years of imprisonment.

Does the Constitution require an indictment and jury trial before imposing a prison sentence for violating supervised release?

Whether the government's seizure of private property without just compensation violates the Takings Clause of the Fifth Amendment