If you have not already done so, make a list of techniques you can use to help you identify and manage your anger. For example, become aware of the body signals that tell you that you are starting to feel angry. Try to figure out what is making you feel this way. Is it something in the present or is it a replay of an old tape from your childhood? If you find yourself getting angry, take a "time out" and give yourself a chance to calm down. Call a friend or a hotline for help in figuring out what is triggering your anger.
There are many ways that you can safely express your anger on your own without hurting yourself or anyone else. One of the best ways is to engage in active sports where you can bash a ball: tennis, racquetball, baseball. Virtually any kind of physical activity such as aerobics or dancing will reduce your feelings of anger. You can write about the anger in your journal, exercise, go for a walk, scrub the floors whatever will dissipate the anger in a safe manner. Other more direct expressions of anger are hitting pillows, screaming in your house or car (though not when driving) and learning martial arts or self-defense skills. Other more intellectual avenues include getting involved in public speaking and political marches and activities.
Write drafts of letters to your abusers expressing your anger with them. You can get a lot of the anger sorted out by writing long letters that detail every imaginable angle of your anger. Whether you send the letters or not is up to you. Sending these types of letters is considered a confrontation, so you will want to give this issue serious consideration.