I wonder if this was maybe Orwell inspiration?
But I agree with the similarities of the Ministry of Truth, and what it wanted to achieve. The issues as I mentioned is that I don't think there's a universal truth to anything; and therefore eradicating wordings or forms of language that are "not good" is a very subjective perspective.
I do not understand - OP was mentioning that the organization worked through second world war and was event at Nurimberg trials. An Orwell written 1984 in 1949. What do you mean that this organization predates Orwell ?
I was just insinuating that Orwell might have known about this history (and probably about similar like this) and use this as inspiration for how dictatorships can use purification of lanuguage for their purposes (in case of Orwell it was more about controling "thought crimes" then abount simple national identification).