After Ford left the White House in 1977, he privately justified his pardon of Nixon by carrying in his wallet a portion of the text of Burdick v. United States, a 1915 U.S. Supreme Court decision that suggested that a pardon carries an imputation of guilt and that its acceptance carries a confession of guilt.
Their grievances mainly had to do with the Coercive Acts, a series of four acts that were established to punish colonists and to restore order in Massachusetts following the Boston Tea Party.