Meantime Congress had returned to the task of bolstering agriculture by passing the Agricultural Marketing Agreement Act of June 3, 1937,[466] authorizing the Secretary of Agriculture to fix the minimum prices of certain agricultural products, when the handling of such products occurs "in the current of interstate or foreign commerce or * * * directly burdens, obstructs or affects interstate or foreign commerce in such commodity or product thereof." In United States _v._ Wrightwood Dairy Company[467] the Court sustained an order of the Secretary of Agriculture fixing the minimum prices to be paid to producers of milk in the Chicago "marketing area." The dairy company demurred to the regulation on the ground of its applying to milk produced and sold intrastate. Sustaining the order the Court said: "Congress plainly has power to regulate the price of milk distributed through the medium of interstate commerce, * * *, and it possesses every power needed to make that regulation effective. The commerce power is not confined in its exercise to the regulation of commerce among the States. It extends to those activities intrastate which so affect interstate commerce, or the exertion of the power of Congress over it, as to make regulation of them appropriate means to the attainment of a legitimate end, the effective execution of the granted power to regulate interstate commerce. _See_ McCulloch _v._ Maryland, 4 Wheat. 316, 421; * * * The power of Congress over interstate commerce is plenary and complete in itself, may be exercised to its utmost extent, and acknowledges no limitations other than are prescribed in the Constitution. Gibbons _v._ Ogden, 9 Wheat. 1, 196. It follows that no form of State activity can constitutionally thwart the regulatory power granted by the commerce clause to Congress. Hence the reach of that power extends to those intrastate activities which in a substantial way interfere with or obstruct the exercise of the granted power."[468]