Probably not a complete list, but these come to mind
Andrew Jackson: Ignoring the Supreme Court, illegal Indian removal
Martin Van Buren: Illegal Indian removal
James K. Polk: Lying to justify invasion of Mexico
James Buchanan: Treason
Andrew Johnson: Treason
Rutherford B. Hayes: Appeasing traitors with the "Compromise of 1876"
Woodrow Wilson: Illegal surveillance against radical groups
Harry S Truman: Illegal War in Korea
John F. Kennedy: Illegal attempted invasion of Cuba
Lyndon B. Johnson: Illegal surveillance against political opponents, illegal War in Vietnam
Richard Nixon: Treason, illegal surveillance against political opponents, illegal War in Cambodia
Ronald Reagan: Iran Contra Scandal
George Bush: Illegal War in Kuwait
Bill Clinton: Illegal War in Kosovo
George W. Bush: Illegal Wars in Afghanistan and Iraq, illegal domestic surveillance
Barack Obama: Illegal War in Libya, illegal domestic surveillance
These, plus:
John Adams - Alien and Sedition Acts
Chester Arthur - Not enforcing 14th Amendment in the South
Grover Cleveland - Not enforcing 14th Amendment in the South
Benjamin Harrison - Not enforcing 14th Amendment in the South
William McKinley - Not enforcing 14th Amendment in the South
Theodore Roosevelt - Conspiring to establish Panama for the sole purpose of building the Canal, Not enforcing the 14th Amendment in the South
William H. Taft - Not enforcing 14th Amendment in the South
Warren G. Harding - Not enforcing 14th Amendment in the South, Corruption
Calvin Coolidge - Not enforcing 14th Amendment in the South
Herbert Hoover - Not enforcing 14th Amendment in the South
Franklin D. Roosevelt - Not enforcing 14th Amendment in the South, Internment of Japanese-Americans, wartime persecution of political dissidents/opponents of the war, violation of the Posse Comitatus Act (use of the army to break strikes)
Pretty much every single President after Grant and before Eisenhower is complicit in not protecting the rights of black Americans in the South after Reconstruction, and should have been impeached for not fulfilling their oath to uphold the constitution, i.e. enforcing the 14th Amendment in the South and allowing for the Southern aristocracy to re-assert power after its defeat in the Civil War.
Also, John Tyler should have been arrested as a traitor after being elected to the Confederate Congress.
TNF, making Communists seem like anarcholibertarians.
