One rapidly evolving area of the law is the application of antitrust law to health care professionals. After the United States Supreme Court decided in 1975 that the “learned professions” were subject to the constraints imposed by the Sherman Antitrust Act, a significant number of antitrust actions have been filed against health care professionals and their professional organizations under Section 1 of the Sherman Act. These suits have found anticompetitive behavior in a variety of forms, ranging from tying arrangements and price-fixing agreements to certain forms of exclusive contracts and group boycotts.