The following excerpt is from U.S. v. Roberts, 618 F.2d 530 (9th Cir. 1979):
A trial judge should be alert to deviations from proper argument. Because such comments have the clear potential for affecting adversely the defendant's right to a fair trial, the judge should take prompt corrective action as appropriate in each case. See Viereck v. United States, 318 U.S. 236, 247, 63 S.Ct. 561, 566, 87 L.Ed. 734 (1943).
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