Strict scrutiny
The idea of "levels of judicial scrutiny", including strict scrutiny, was introduced in United States v. Carolene Products Co. (1938), one of a series of decisions testing the constitutionality of New Deal legislation. The first and most notable case in which the Supreme Court applied the strict scrutiny standard and found the government's actions valid was Korematsu v. United States (1944). In Korematsu the Court upheld the government ruling 6-3 that the need to protect the country from espionage outweighed the rights of Mr. Korematsu.