United States V. Darby

The two principal questions raised by the record in this case are, first, whether Congress has constitutional power to prohibit the shipment in interstate commerce of lumber manufactured by employees whose wages are less than a prescribed minimum or whose weekly hours of labor at that wage are greater than a prescribed maximum, and, second, whether it has power to prohibit the employment of workmen in the production of goods `for interstate commerce' at other than prescribed wages and hours. A subsidiary question is whether in connection with such prohibitions Congress can require the employer subject to them to keep records showing the hours worked each day and week by each of his employees including those engaged `in the production and manufacture of goods to wit, lumber, for `interstate commerce."