Right wing coup in Italy if Communists win?

If the Communist Party of Italy wins in any election from the 1950s until their death in 1991, what is the chance of a Right wing coup?
 
Yes, Solo and Borghese were (supposedly) farcical attempts, but I'm quite certain something more credible would have been devised if the reds had actually won. An expulsion from NATO wouldn't have worked, there was too much at stake.

The question is: what happens next? A civil war? Continuous sabotages? Political cleansing à la Chilean/Argentinian?
 
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