Both books allege a climate of liberal bias in which reporters routinely slant or spike news stories to ensure that the media presents a unified "front" which brooks no opposition to the liberal point of view.
Journalistic Fraud details the precise way this is done, giving copious examples from the pages of the New York Times. For example, such simple tactics as omitting the adjective "liberal" when describing liberal sources while making sure to apply the adjective "conservative" when describing conservative sources. This bolsters the liberal view that liberals are really "mainstream".