Last week, a federal judge ruled that B.G., a rapper known for the hit 1999 song “Bling Bling,” must give the government copies of the lyrics to any new songs as a condition of his supervised release. While prosecutors can generally place a wide range of otherwise illegal restrictions on released prisoners’ conduct, critics argue this restriction is an unconstitutional prior restraint on speech. In 2012, B.G., whose real name is Christopher Dorsey, was sentenced to 14 years in prison for illegal gun possession and obstruction charges. After serving 11 years, Dorsey was released in February. In…