You should consider the noun purged, but before you do, also consider the Great Purge, which is described as
a campaign of political repression in the Soviet Union orchestrated by
Joseph Stalin from 1934 to 1939.
This involved the repression or prosecution of people considered counter-revolutionaries and enemies of the people by the leadership of the Soviet Union.
So the word repressed may suffice, but it doesn't have the same sense as purged, where a purge is
an abrupt or violent removal of a group of people from an organization or place.
You obviously also considered how the verb persecute works here, but even persecute does not carry the full meaning of being removed as purge does. (Otherwise persecuted rather than persecutee would be the right form of the word.)
Using the word purged as a noun is useful if you are describing a number of people (The purged were sent to the Gulags). But when describing an individual, it doesn't work. (He was one of the purged. or simply He was purged.) Repressed and persecuted would be used in a similar way.
Let's consider your own example of persecutee or purgee. While this form finds its way into common discourse, it still sounds rather tortured and/or legalistic, and in many cases, as I described above, a more natural sounding form already exists.
There's this film, a classic, starring Steve McQueen and Richard Attenborough, set during the second World War at an Air Force Prisoner of War camp in Germany. The film, if you haven't guessed by now, is called The Great Escape, based on real-life events that happened in Stalag Luft III, Sagan, once a German town, 100 miles south-east of Berlin.
In the film there is a Flight Lieutenant pilot called Robert Hendley, an American in the RAF, whose nickname is "the scrounger"
who finds what the others need, from a camera to clothes and identity
cards
Interestingly, the actor who portrayed this role, the gorgeous-looking James Garner, had been a soldier in the Korean war and he too had been a scrounger during that time. Unfortunately, today the term has very negative connotations especially in BrEng where it is synonymous with moocher, sponger and a freeloader but according to War Slang. American Fighting Words and Phrases Since the Civil War by Paul Dickson, its meaning was slightly more noble.
Scrounge. To appropriate; to misappropriate. In Behind the Barrage,
published shortly after the war, British writer G. Goodchild
discusses the term:
In the category of "odd jobs" came "scrounging." "Scrounging" is
eloquent armyese; it covers pilfering, commandeering, "pinching,"
and many other familiar terms. You may scrounge for rations, kit,
pay, or leave. Signalers are experts at it, and they usually
scrounge for wire. Scrounging for wire is legitimized by the War
Office, and called by the gentler name of "salving."
and further on
scrounger. One adept at acquiring food and other goods.
Oxford Dictionaries says scrounger in AmEng is
A cleverly resourceful person who finds and procures items for a
specific purpose
So, it kinda fits if the character is American or is given the nickname of Hendly; however, the author would have to give a brief justification for this name.
Best Answer
Consider