Joseph McKenna, Bethlehem Motors Corporation v…
“ It is a perilous power to concede to the state, and it is immediately manifest that it can be exerted to prevent all commerce of those corporations (or other corporations) with the state except as the commerce might be through direct personal purchases and importations. In other words, the power can be exerted to exclude the products of those corporations, and every other corporation, if they have, or it has, agents in the state. ”
