This was a case where in June 1987, the United States Court of Appeals for the 9th Circuit upheld the Witnesses' right to shun those who fail to live by the group's standards and doctrines, upholding the ruling of a lower court.
http://openjurist.org/819/f2d/875
Has there been any cases after this, where DF cases went to court? Have there been cases in other countries were DF decisions were challenged and reversed?