Mafioso, mafioso
Capitalize for Mafia member(s) or as an adjective pertaining to the Mafia and its criminal operations:
Mafioso, Mafiosi
but lowercase for a mafia:
mafioso, mafiosi
Capitalize for Mafia member(s) or as an adjective pertaining to the Mafia and its criminal operations:
Mafioso, Mafiosi
but lowercase for a mafia:
mafioso, mafiosi