Frida Hahn

[Rankin, Robert L]

Yes.  
 
And don't forget that Frank Siebert (note German name) was arrested by the FBI in Oklahoma in 1941 while working briefly on Quapaw.  They seemed to think he was un-American.
 
Bob
 
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> As to German linguists working in the 20s and 30s on Oklahoma languages and going back to Germany, wasn't that the case with Gunter Wagner, who worked on Yuchi? 

Anthony