What should I do if my coworkers don't like me?

Anonymous
When I first started my coworkers who already worked in my dept didn't like me. They had their own alliance and pretty much single me out. It was 3 of them. We have hired tons of new people and they get along with the new people. The new people get along with me and other coworkers from other dept like me as well. The 3 coworkers get so pissed when they see other coworkers getting along with me and being nice.
What should I do if my coworkers don't like me?
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