Library Research Project. It was observed in the chapter that collusion among oligopolists can be facilitated in part by information sharing. As a consequence, the sharing of price information among rival oligopolists can violate U.S. antitrust laws. You can see how the U.S. Supreme Court has interpreted antitrust law as it pertains to sharing price information by reading a summary of the case of U.S. v. U.S. Gypsum Co. et al. (438 U.S. 422), which is available at www.stolaf.edu/people/becker/antitrust/summaries/438us422.htm. In what manner was price information shared, and why did the court find these actions to be an antitrust violation?