The media likes to minimize the support for the right in Italy, but it's far larger than they show.
I was in a museum last year in the former Pontine Marshes that Mussolini did a lot to drain and settle. The placards still referred to him as "Il Duce."
It’s actually not certain the Romans saluted that way.
I don’t think they were dressed in black shirts to look more Roman. For that, they’d be wearing metal pleated mini skirt. The fascists might have started that salute because it was supposedly from ancient Roman times, but the black shirts were not.