PRESIDENTIAL PARDONS. JURIST: The Legal Education Network at the University of Pittsburgh School of Law presents this guide as a non-partisan educational resource on the law of Presidential pardons.
From the site:
Who did previous Presidents pardon, and how many pardons did they issue?
Given the unlimited range of discretion provided in Article II, Section 2 of the Constitution, previous Presidents have pardoned reprobates, political allies, wrongly-convicted persons, friends, contributors and outright rebels. For individual pardons by particular Presidents, see Notable Pardons. Of the all-but-two Presidents who granted pardons between 1789 and 2001 (Presidents William Henry Harrison and James Garfield did not live to do so), Franklin Delano Roosevelt issued the most clemency orders (3687), while George Washington issued the fewest (16).