In a word, Foibe.
One of the blackest pages in the history of man, which in his absurd madness cost the lives of about 11,000 people.
«… Already in the unravening of the first wave of blind violence in those lands, in the fall of 1943, “Summary and tumultuous justnationalism, nationalist paroxysm, social rivaling and a drawing of eradication” of the Italian presence from that which Was, and ceased to be, the Venezia Giulia. There was therefore a motion of bloody hatred and fury, and a Slavic annexation plan, which prevailed first in the peace Treaty of 1947, and assumed the sinister contours of an “ethnic cleansing”.» (Cit. G. Napolitano)
Not to forget.