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Giovanni Giolitti was Italian prime minister till 1914 and strongly opposed to the war. He (as others) was aware of the treaty and opposing to the war. What if he and/or other liberal, radical, and socialist decided to expose the Treaty of London http://en.wikipedia.org/wiki/London_Pact, that has never ratified in parliment, in an effort advert the italian involvement?
That will be an act directly against the King Victor Emmanuel III, that pushed very much in favor of the war. Royalism in Italy was very strong and irredentism on the rise. On the other hand Socialist, Liberal and Popular Catholic were on the rise too and generally opposed to the war. An open revolt would be probably easily crushed (with consequences). A civil disobedience especially during the war will be however a big problem not easily solved. Also, though I don't know the source, it seems AH actually offered Trento to Italy and Trieste as a free city status, if Itally maintained its neutrality. If that was true, and exposed to the general public irredentism would be strongly curbed.
Last, but not the least, what will be the effect on the Entente as a whole? To say the least the Entente will have a tougher time into gaining a moral high ground over the central powers. IMHO at the beginning of the war it haden't, England and France weren't particularly more democratic the CP powers and actually behind in socially.