Dottore? isn't his name Marcello Clerici ?
why did Manganiello call him by the name Dottore?
shareApparently, in Italy anyone with a university degree is addressed as "dottore."
The significance is that Marcello wants to be addressed as "camarata," but Maganiello has him pegged as a coward and weakling -- and thus not a real Fascist -- so insists on using the civilian title.
http://redkincaid.com
In Italian the term dottore can be used with the same meaning as sir, especially in the past.
A person didn't had to have a degree, it was enough to be someone's superior, for example
Source: I'm Italian