The song echoed a ballad “Tomorrow Belongs to Me,” sung by a member of the Hitler Youth in a chilling scene in the movie “Cabaret.” Mr. Croppi acknowledged that the camps had their fair share of Fascist salutes, but argued they were “ironic.” When Ms. Meloni entered the picture as a teenage activist in the Youth Front in Rome in the 1990s, the far right — especially in the capital — was still in a trenchlike mentality, struggling to break with the previous generation. Francesco Lollobrigida, a leader in Ms. Meloni’s party, Brothers of Italy (as well as her brother-in-law),...