He wrote that the “nativistic American mentality, born of ignorance and nurtured by malice,” insisted on stereotypes of Italian Americans as either “spaghetti-twirling, opera-bellowing buffoons in undershirts (as in the TV commercial with its famous line, ‘That’sa spicy meatball’), or swarthy, sinister hoods in garish suits, shirts and ties.”
Source: wiktionary