What legal help for domestic abuse by my family members?

Since my marriage, my father, mother, and younger brother have been creating almost daily disturbances, which escalate into heated arguments and sometimes physical violence against my wife. The problems usually start with small issues, then they blame my marriage and my wife for everything illogically. They also criticize the small dowry given by her father and her in-laws’ behavior. My wife tolerates all of this quietly at first, but they eventually end up beating her, even in front of me. I try to calm them down, but nothing helps. Sometimes we have to lock ourselves in our room out of fear of further violence. My father takes my salary by having it transferred to his account, claiming that he doubts my wife will misuse it by giving it to her family, which I believe is not true. They also have possession of all her jewelry.