At least three people have been arrested as part of a larger investigation.
Prime Minister Matteo Renzi's party slams judge's comments about rampant graft in government.
Luigi Tancredi, accused of heading the ring, installed poker screens in bars and gambling rooms run by Italian mafias.
Five Costa Ricans and two Cubans were arrested over the course of ten raids.
Italian police had been monitoring a farm linked to a notorious mafia boss since 2011.
Africo is the poorest town in Italy. Most of its youth have moved away to look for jobs. The rest have one choice: join the Mafia or languish in a stagnant economy.
The country ranked 73rd in a 180 country index on global freedom of expression in 2014.
Set up by a group of idealistic youths, a popular civic movement is putting Sicilian crime bosses out of business
Russian, Chinese and Georgian gangs, as well as the Italian mafia, are now pumping billions into legal businesses