The Most Controversial Presidential Pardons in US HistoryBy Karla Pavelka / August 26, 2019 Samuel Arnold Public Domain Who pardoned him: Andrew JohnsonWhat he was pardoned for: Conspiracy to commit murderWhy it was controversial: The person he was guilty of trying to murder was Abraham Lincoln. Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24