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Discover Ludwig'fifth columnist' is correct and usable in written English.
It is a noun that refers to a person who works for a hostile foreign power or organization within their own country. For example, "The government was concerned that the infiltrator was a fifth columnist working to undermine the nation's security."
Dictionary
fifth columnist
noun
Someone who belongs to a group that secretly undermines another organization
synonyms
Exact(27)
State TV regularly branded Nemtsov a fifth columnist.
Some viewed him as a kind of Conservative fifth columnist.
A FIFTH columnist has infiltrated the menus of Manhattan.
There have been accusations and counter-accusations: who is leaking intelligence, who is a fifth columnist".
But portraying Sanders as some kind of LGBT fifth columnist is a reach.
Now, it seems, to be a Kremlin fifth columnist is a political badge of honour.
Similar(33)
There are fifth columnists of cuisine everywhere.
I like the idea of fifth columnists and subversion.
But Islamist hardliners in Sudan objected, accusing southerners of being fifth columnists.
Instead, it could be directed against "traitors" and "fifth columnists" at home.
Given suspicions about fifth columnists at the time, he was lucky to get away with this.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com