When it came to the Jews, the Italian Fascists didn't hold a candle to their German allies. On the contrary, in Yugoslavia and France, high-ranking Italian fascist officials actively thwarted Nazi anti-Jewish policies. (I wrote a chapter about this in Hitler's Bureaucrats: The Nazi Security Police And The Banality Of Evil). Mussolini's role, however,has long been enigmatic.
Less so now, apparently. According to the diaries of his mistress, he was a racist, an antisemite, and proud of it all. This may not be definitive proof to shut down all discussion, but it's a serious source. Remember, the mistress, Clara Petacci, was lynched alongside Mussolini in 1945, so the diary reflects the man as seen at the time, without any sanitizing post-fact cleanups.