Even before Vice President Agnew gave his "nattering nabobs of negativism" speech-blasting the networks for their pervasive bias against, e.g., Republicans, and in favor of, e.g., rioting students-the veteran journalist Edith Efron had begun a clinical study of the 7 PM network news shows. The resulting book had just now been published. Her findings: that the networks are indeed biased in a left-liberal way, and that the network executives know it even though they deny it. How much does it matter? "The situation is enormously dangerous because so long as you have actual bias on the air of a publicly owned medium, which is supposedly regulated by a fairness doctrine, and then huge numbers of citizens are aware of this bias and are intensely angered by it, it is a set-up for an assault on the First Amendment from which we might not recover." Mr. Rooney launches a spirited defense, and we're off to the races.