The following excerpt is from U.S. v. Murray, 751 F.2d 1528 (9th Cir. 1985):
Former section 1503 proscribed corrupt or violent efforts to prevent a witness from testifying. 2 Section 1510 forbids threatening efforts designed to prevent a person from communicating information about a crime to a federal investigator. Under both statutes, it is not necessary to show that a defendant actually obstructed justice or prevented a person from communicating to law enforcement officers--the statutory focus is on an endeavor. See United States v. Rasheed, 663 F.2d 843, 852 (9th Cir.1981), cert. denied, 454 U.S. 1157, 102 S.Ct. 1031, 71 L.Ed.2d 315 (1982);
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