Inmates should not have the right to strike or protest labor practices while in prison. When someone breaks a law, they should not have the same rights as someone who has not broken the law. The prisoners are in prison because they did something that was not right. They deserve to have some of their rights taken away while they are learning their lesson.
Inmates should not have a right to strike and protest labor practices in the prison because once you go to jail you lose your right to do anything. You gave that up when you committed your crime. Instead of striking, perhaps they should kiss the ground they walk on for getting free housing, three squares a day and cable. Don't do the crime if you can't do the time. Buncha whiners.
Prisoners should be humanely treated, but prison is supposed to be punitive, so it's not like the world at large where prisoners should be able to strike over. If the working conditions for prisoners are dangerous and violate basic human rights, that's another story, but if this is just a protest over wages or hours, I don't think so.
I would say that prisoners have certain level of human rights but to let them organize would be dangerous. There are other alternatives such as choosing legal representation to speak for them. The legal representation can meet with prisoners and gather information without letting the inmates organize which could potentially lead to the inmates working together on more nefarious causes.