What rights do prisoners have to freedom of speech?

Individuals sentenced to prison simply do not enjoy the same liberties as ordinary citizens. Obviously, their ability to travel freely is practically negated. They can be locked up, ordered about, told when to eat, when to exercise, when to shave, when to shower, and when to sleep. They also may be deprived of their right to vote. See Richardson v. Ramirez, 418 U.S. 24, 94 S.Ct. 2655, 41 L.Ed.2d 551 (1974). It should therefore surprise no one that prisoners do not enjoy the same First Amendment rights as law-abiding citizens.