There is one instance of bloody violence towards the end of the movie.
Very intense prison physical and mental violence. A raw box fighting between Luke and a big guy with a little display of blood. A convict gets beaten up repatedly with sticks. A prison ''boss'' is attacked by a convict who almost strangles him.
The prisoners force a man to eat lots of boiled eggs. He lies unconscious on the table.
Prisoners are seen being beaten by guards (not a lot of blood is shown).
In several scenes Luke is badly injured and unable to stand or walk properly.