They Shall Not Pass!

[Inziladun]

This is an interesting thread, one I'd never found in all this time.

A lot of good points are here already.

I do think it's notable that Gandalf says nearly the same thing to the Lord of the Nazgûl, when the latter is threatening to ride into Minas Tirith.

'You cannot enter here,' said Gandalf.

In both instances Gandalf seeks to bar a foe from getting by him, and uses similar verbiage.

I don't think there was any connection between Gandalf's words and generic partisan-speak, at least not in Tolkien's mind.