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In page Gentlemen's agreement:

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Gentlemen's agreements were a widely used discriminatory tactic reportedly more common than restrictive covenants in preserving the homogeneity of upper-class neighborhoods and suburbs in the United States.[citation needed] The nature of these agreements made them extremely difficult to prove or to track, and were effective long after the United States Supreme Court's rulings in Shelley v. Kraemer and Barrows v. Jackson. A 1995 source stated that gentlemen's agreements "undoubtedly still exist", but that their use had greatly diminished.[1]