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A state court conviction or acquittal on a substantive offense does not bar the use of that substantive offense as a predicate offense under RICO and does not violate the double jeopardy clause of the fifth amendment. [RICO] forbids 'racketeering,' not state offenses per se. The state offenses referred to in the federal act are definitional only; racketeering, the federal crime, is defined as a matter of legislative draftsmanship by a reference to state law crimes. This is not to say . . . that the federal statute punishes the same conduct as that reached by state law.

The gravamen of section ...