From wiki: While Secretary General [of NATO], Ismay is also credited as having been the first person to say that the purpose of the alliance was "to keep the R

From wiki: While Secretary General [of NATO], Ismay is also credited as having been the first person to say that the purpose of the alliance was "to keep the Russians out, the Americans in, and the Germans down," a saying that has since become a common way to quickly describe the alliance.