436 U.S. 103 98 S.Ct. 1702 56 L.Ed.2d 148 SECURITIES AND EXCHANGE COMMISSION, Petitioner,v.Samuel H. SLOAN. No. 76-1607. Argued March 27-28, 1978. Decided May 15, 1978. Syllabus The Securities and Exchange Commission (Commission) has the authority under ? 12(k) of the Securities Exchange Act of 1934 (Act) “summarily to suspend trading in any security . […]