66 Kee p ing Fa i th w ith t he C o nsti tuti o n
the Supreme Court interpreted the principle of federalism to limit Congress’s
power to regulate the economy, reserving much of that sphere for state gov-
ernments. The principle of federalism is implicit in Article I’s enumeration
of limited federal powers, and it is made explicit in the Tenth Amendment’s
reservation to the states of powers not delegated to the federal government.
However, the Constitution does not state the principle with the precision
necessary to resolve particular disputes over the scope of federal power. Con-
sider, for example, Congress’s power to regulate interstate commerce.
3
Before
1937, the Supreme Court often applied the federalism principle by adhering
to the eighteenth-century understanding of the term “commerce.” As Justice
Thomas has explained, “[a]t the time the original Constitution was ratified,
‘commerce’ consisted of selling, buying, and bartering, as well as transporting
for these purposes. . . . [T]he term ‘commerce’ was used in contradistinc-
tion to productive activities such as manufacturing and agriculture.”
4
Ap-
plying this definition, the Court repeatedly struck down federal regulation
of manufacturing, mining, agriculture, and other “local” activities on the
ground that they occurred “prior to” commerce and affected commerce only
“indirectly.”
5
Under this reading of the Commerce Clause, the federal government could
not enact laws to address labor inequities or to establish minimum wages or
maximum hours in vast parts of the American economy. Moreover, the Court
took a similarly narrow view of the Taxing and Spending Clause, disabling
Congress from imposing taxes on businesses in part to implement regulatory
policy unless some other enumerated power authorized the objectives Con-
gress sought to achieve.
6
This limitation cast serious doubt on the validity of
the 1935 Social Security Act for workers in manufacturing, mining, and other
activities occurring “prior to” interstate commerce. The National Labor Re-
lations Act, which established procedures for collective bargaining, was also
constitutionally suspect before 1937.
The second doctrinal roadblock to enacting social and economic policy
was the Supreme Court’s interpretation of the Due Process Clause in Lochner
v. New York.
7
Just as narrow construction of the commerce and spending pow-
ers limited Congress’s ability to regulate the economy, so too did the Court’s
construction of Fourteenth Amendment “liberty” to encompass “freedom of
contract” disable state governments from enacting various labor laws, price
regulations, maximum hours and minimum wage laws, and other economic