Harlan F. Stone,
International Shoe Company v. Washington…
“ The Supreme Court of Washington, construing and applying the statute, has held that it imposes a tax on the privilege of employing appellant's salesmen within the state measured by a percentage of the wages, here, the commissions payable to the salesmen. This construction we accept for purposes of determining the constitutional validity of the statute. The right to employ labor has been deemed an appropriate subject of taxation in this country and England, both before and since the adoption of the Constitution. ”
