proleaguer

noun

noun

Historical A supporter of the League of Nations.

But the singular thing presented in the discussion is that the proleaguers want us to go into the court because they think the President mistaken, and the antileaguers want to keep us out of the court for precisely the same reason.1926, Congressional Record: Proceedings and Debates..., United States, page 2353:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.