The power of Congress over interstate commerce "is complete in itself, may be exercised to its utmost extent, and acknowledges no limitations other than are prescribed in the Constitution." Gibbons v. Ogden
Congress having by the present Act adopted the policy of excluding from interstate commerce all goods produced for the commerce which do not conform to the specified labor standards, it may choose the attainment of the permitted end even though they involve control of intrastate activities
This regulation is not a forbidden invasion of state power because either its motive or its consequence is to restrict the use of articles of commerce within states of destination, and is prohibited unless by other Constitutional provisions.
the Sherman act and the National Labor Relations act are familiar examples of the action of the commerce power to prohibit or control intrastate activities because of their effect of interstate commerce