Google announced today that Arthur D. Levinson resigned from its board of directors.  However, Mr. Levinson remains on Apple’s board of directors.  Mr. Levinson was the remaining common director on the Google and Apple boards.  As reported in the June 3, 2009 Post, Eric D. Schmidt, Google’s CEO, resigned from Apple’s board amid antitrust concerns raised by the FTC.  The June 3 Post noted that it was unclear whether the FTC would require Mr. Levinson’s resignation from one of the boards.  Apparently, the FTC did just that as FTC Chariman Jon Leibowitz said, “Google, Apple and Mr. Levinson should be commended for recognizing that overlapping board members between competing companies raise serious antitrust issues, and for their willingness to resolve our concerns without the need for litigation.”  Chairman Leibowitz further warned, “[b]eyond this matter, we will continue to monitor companies that share board members and take enforcement actions where appropriate.”  It seems that the FTC is warning corporations that it plans to take an increased interest in enforcing section 8 of the Clayton Act, which prohibits interlocking directorates among competitors under some circumstances.  That statute has not been enforced with much frequency.  Nevertheless, antitrust practitioner always have to be concerned that the existence of common directors could be used as evidence of a conspiracy between the two corporations in violation of the Sherman Act because it provides an opportunity to conspire.  Accordingly, antitrust practitioners know to advise against such overlaps among corporations vulnerable to Sherman Act litigation without regard to section 8 of the Clayton Act.