How can by laws for the neighborhood be enforced?

In my neighborhood here in Dallas, it explictally states from 1963 ( when this house was built ) that no blacks, hispanics,or jews can live in this subdivsion. How then did a black couple move into our neighborhood? I can't say I am upset at all that one of our neighbors burned a cross on their lawn. I want them out as does everyone else in this sub division. We moved here for a reason. What areour options?
 
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