My evil cat

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My cat will actually try to attack a couple of people that come to our house.It is mostly my husbands friend when he walks threw the door my cat will be on him.Her ears go back and she will hiss and sometimes she will snarl at him.I would like to help her get along with him but I don't know what to do.She is normally not like that she is lazy and justs sits around the house but when those people come over she is another cat.