Whether Callanan v. United States, 364 U.S. 587 (1961), should be overruled or limited as violative of the Double Jeopardy Clause where petitioner was twice convicted and double sentenced to 40 years' consecutive imprisonment for a single violation of the indivisible Hobbs Act, 18 U.S.C. § 1951(a), by attempting to rob a convenience store in a momentary, coterminous conspiracy.

Whether Callanan v. United States should be overruled or limited as violative of the Double Jeopardy Clause where a defendant was twice convicted and sentenced for a single violation of the Hobbs Act