Korematsu v. United States , was a landmark United States Supreme Court. It concerned the constitutionality of military commanders, under an executive order by the President, which ordered Japanese Americans into internment camps during World War II. This was regardless of their citizenship. In February of 1942, President Franklin Roosevelt issued Executive Order No. 9066. This gave military commanders the power to evacuate all persons considered a threat to national security from the West Coast of the United States to relocation centers. Fred Korematsu, a Japanese-American who was born in the United States, refused to comply with the order. He became a fugitive, but was arrested and sentenced to five years probation. He appealed his conviction with the Ninth Circuit Court of Appeals. After having his conviction upheld, the case was heard by the U.S. Supreme Court. In a 6-3 decision, the Court upheld his conviction and ruled the exclusion order was constitutional.