There are some war/dystopian movies when, as some sort of violent regimen grows, former friends or acquaintances - who usually have opposing viewpoints to the protagonist, to some degree - end up becoming part of the regiment, usually as officials or authority figures of some sort.

Some examples:

  • "The Pianist" - a friend of Szpilman becomes a Ghetto Police Officer;
  • "Dr. Zhivago" - Pasha Antipov becomes Strelnikov;

The trope poses a symbolic question, IMO, as to the extent to which political divergences between you and some person you know are potentially dangerous if the power balance is disturbed.

  • So, yeah, I guess such a trope exists. Now what is the actual question you're asking here? – Napoleon Wilson Sep 6 '16 at 14:36
  • @NapoleonWilson "(How do you call the) trope for a friend who gradually turns into an enemy as a war develops?" – heltonbiker Sep 6 '16 at 20:26
  • 1
    Please ask your question in the form of a question. – sanpaco Sep 6 '16 at 22:50

Face Heel Turn, as coined in wrestling for a face character, the good guy, to turn into a heel, a bad guy. Also http://tvtropes.org/pmwiki/pmwiki.php/Main/BigBadSlippage or We Used to Be Friends if it's someone close to the main character. Any number of sub tropes to those really.

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