"little green men" / "take me to your leader" origin?

[Jonathan Lighter]

Can anyone establish an early date for "little green men"? OED no have. I suspect it comes from the pulp sf days of the interwar period, because I've never heard of a UFO case that seriously reported "little green men" hopping from a landed saucer.

Another query: Was there originally a cartoon or something with the stereotypical alien demand, "Take me to your leader ?"

I've known both these phrases since the late '50s.

JL

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