Final answer:
Woodward and Bernstein's third front page report delved into the Watergate scandal, revealing the White House's involvement in the break-in at the Democratic Party headquarters, which contributed to the eventual resignation of President Nixon.
Step-by-step explanation:
Woodward and Bernstein's third front page report covered the Watergate scandal, specifically the deep implication of the White House in the Watergate break-in. Utilizing information from anonymous sources, particularly one known as "Deep Throat," later revealed to be Mark Felt, then the FBI's associate director, Woodward and Bernstein continued to publish findings that kept public attention on the developing scandal. This investigative journalism played a significant role in bringing to light President Richard Nixon’s involvement in illegal activities and eventually led to his resignation and the indictment of numerous individuals in his administration.