At no time in this century was the devotion to that principle more vigorously evoked than in 1937, when Franklin Roosevelt introduced a plan to increase the number of Justices on the Supreme Court. The conflict set off by the President's plan is more understandable when viewed in the historical context of expanding judicial power as well as in the contemporary context of pro- and anti-New Deal politics.
In the early national period, the judiciary was the weakest of the three branches of government. When Chief Justice John Marshall established the principle of judicial review in MarburyMadison by declaring an act of Congress unconstitutional, he greatly strengthened the judiciary. Even though the high court exercised this prerogative only one other time prior to the Civil War (Dred Scott v. Sanford), the establishment of judicial review made the judiciary more of an equal player with the executive and legislative branches.
After the Civil War, the Court entered a phase of judicial activism based on a conservative political outlook that further enhanced its own power. In accepting the view that the 14th amendment should be interpreted to protect corporations, the Court struck down laws that protected workers, such as minimum wage laws and laws prohibiting child labor. Critics of the Court's stand, including Justice Oliver Wendell Holmes, argued that these decisions were not based on the Constitution but upon the laissez-faire theory of economics. By 1937 the Court was widely regarded by the public as