See, e.g., ?? 10 of the Clayton Act, 38 Stat. 734, 15 U.S.C. ?? 20 (1964 ed.) (requiring competitive bidding for certain transactions between a common carrier and other corporations when there are common directors), United States v. Boston & M. R. Co., 380 U.S. 157; ?? 16(b) of the Securities Exchange Act of 1934, 48 Stat. 896, 15 U.S.C. ?? 78p(b) (1964 ed.) (providing that profits made by directo