Brutality in a dream is often a sign of repressed anger in real life. If you dream that you are behaving brutally toward another person, you are releasing repressed anger toward that person or toward something that person represents.
A dream that you are committing acts of brutality or violence can be a warning that you need to deal with your anger in a constructive way before you lose the ability to control it.
Engaging in brutality in a dream can also mean that you are afraid that expressing your basic instincts and desires will have dangerous consequences.
A dream that someone is behaving brutally toward you can mean that you have been mistreated or neglected emotionally.
If you have been a victim of physical brutality in real life, you may relive your experience in your dreams.