From the Supreme Council of the Order of the Knights of Columbus website:
Pope Benedict XVI has announced a consistory on November 20, at which he will elevate 24 bishops and archbishops to the College of Cardinals. Three of them are Knights of Columbus, including Archbishops Raymond Burke, prefect of the Supreme Tribunal of the Apostolic Signatura, Donald Wuerl, archbishop of Washington, D.C., and Kazmierz Nycz, archbishop of Warsaw.
Archbishop Burke became a Knight in 1977, at LaCrosse (Wisconsin) council 839 while he was still a parish priest. He became the Bishop of LaCrosse in 1995. He transferred to Bishops Council 10490 when he became Archbishop of St. Louis in 2004. Pope Benedict named him to head the Supreme Tribunal, sometimes referred to as the Vatican’s “supreme court,” in 2005, and he remains a member of Council 10490.
Archbishop Wuerl became a Knight at Duquesne Council 264 while serving as a priest in the Diocese of Pittsburgh in 1979. He became Bishop of Pittsburgh in 1988, and while there, wrote a series of articles for Columbia magazine on the writings of Pope John Paul II. He transferred to Catholic University of America Council 9542 when he became Archbishop of Washington, D.C. in 2006.
Archbishop Nycz became a Knight at Warsaw Council 14271 in November 2007, about six months after the council was established, and seven months after he became Archbishop of Warsaw.