<span>Ho Chi Minh. Despite being the communist founder of Vietnam, early on when the French were still in power there and years before the Vietnam War, he asked Truman for help.</span>
Answer: Debt Peonage 100%
A law that makes illegal an act that was legal when committed, increases the penalties for an infraction after it has been committed, or changes the rules of evidence to make conviction easier.
The case was called the Dred Scott V. Sandford. The case was decided by the Supreme Court after Scott said he should be freed as he lived in a place where slavery was illegal.