The President's power to pardon is broad, unchallengeable, and almost unlimited. Here are 25 of the most controversial pardons and commutations in history.

• US presidents have the power to pardon anyone in the country who has been convicted of a federal crime.
• They have pardoned and commuted sentences of advisors, celebrities, and family members.
• Presidents can also pardon other presidents, like when Gerald Ford pardoned Richard Nixon after the Watergate scandal.

For the last few hundred years, US presidents have pardoned people convicted of federal crimes.

While the crimes varied, they shared the commonality of their pardons being marred with controversy.

From clemency for former confederates to Vietnam draft dodgers to pardoning the billionaire fugitive Marc Rich, here are some of the most notable presidential pardons in history.