The Wall Street Journal, in 1984 (on the Fourth of July, no less) ran an editorial explicitly positioned against "'nativist' Americans" and calling for "a five-word constitutional amendment: there shall be open borders"
Slobodian is careful to note that they defended this position "in economic rather than humanitarian terms" (80)
in 1990, they observed that "human capital [was] increasingly the coin of international 'competitiveness'," positioning them in line with something like a Mises-ian advocacy of free human movement [see separate note]