"Apparently it took the invocation of the Defense Production Act to stop 3M from selling masks and PPE to cash paying foreign governments; forcing them to supply the U.S. federal government and states instead."

https://theconservativetreehouse.com/2020/04/02/u-s-multinational-company-3m-sells-masks-and-ppe-to-foreign-governments-while-u-s-states-look-for-products/