Fanon renounced France after experiencing racial inequality in its army. [fact]
Another doctor to come over to the F.L.N., body and soul, at this time was the impassioned Martiniquais, Frantz Fanon. During the Second World War Fanon had joined the Free French, been wounded and decorated in the liberation of France, but then made the painful discovery that a black man was not treated as an equal in the French army. In 1956 he wrote a bitter letter to the governor-general, resigning his post at the Blida psychiatric clinic, and joined the underground. He became one of the revolution's most articulate and extreme ideologues, and a violent exponent of anti-colonialism in any shape.
XREF: Connects to Fanon's later works like The Wretched of the Earth, which formalized this anti-colonial radicalism.
Horne, Alistair, A Savage War of Peace- Alge…, loc. 429