The most famous piece of evidence from the Watergate Scandal was

The most famous piece of evidence from the Warergate Scandal were the tapes President Nixon secretly recorded in the Oval Office that revealed his part in the Watergate scandal.

Explanation: On June 17, 1972, 5 men were arrested for breaking in to the Democratic Party headquarters located at the Watergate Hotel in Washington. The men were tried, and convicted and on sentencing two of the men told the Judge that President Nixon was not only involved in the plan, he was also a major part of the cover up. There was no hard evidence. Nixon fired a large part of his staff promising a full investigation. However, Alexander Butterfield revealed that there were secret presidential recordings of all that had happened. Nixon tried to block the release of the tapes but was ordered by the court to release them. When they were finally released, there was a large gap of silence on one of the tapes. The Supreme Court demanded transcripts of the tapes which Nixon turned over on August 5, 1972.  Three days later, ixon resigned.