What is the Italian translation of the English phrase 'gangsters kitchen'?

Cucina di mafiosi is just one Italian equivalent of the English phrase "gangsters' kitchen".

Specifically, the feminine noun cucina is "kitchen". The preposition di means "of". The masculine noun mafiosi translates as "criminal, gangster, Mafia member, mobster".

The pronunciation will be "koo-TCHEE-na dee ma-FYO-see" in Italian.