m husband's brother in law is a member of .....

and they always treathen me whenever i dont follow their rules. and last week we had am argument my mom in law and me. she's always so mean and she always make the situation worse and say something that isn't true. I received a text again this morning that they will go and find me. My husband can't do anything coz i think he is also afraid of his brother in law. he rules this family and even my parents in law follows him. I know blood is thicker than water so i told my husband to stay with his family and I will just move with our THREE kids. They are always crazy with money and whatsoever. If there is somebody who knows or what should I do. This is a family problem and I dont know how korean deal with it. If it just an arguement yelling at me cursing me but they are threathening me... do you think they will listen to me if i go to police staion?