The brother of jailed Cosa Nostra boss-of-bosses Salvatore Riina was arrested Friday by Italian police in Sicily, DPA reported.
The 79-year-old Gaetano Riina was picked up during a dawn raid at his house in Mazara del Vallo in southern Sicily.
Authorities suspect Riina of running an extortion ring targeting shops and businesses in and around the town of Corleone - the brothers' hometown.
Three other people were also arrested in the operation, including two great-nephews of Riina's: Alessandro Correnti, 39, and Giuseppe Grizzafi, 33, the ANSA news agency reported.
Salvatore Riina's crime family, the Corleonesi, became notorious in the 1980s and early 90s for its bloody attacks on other mob clans and also state officials including the 1992 killings of anti-mafia magistrates Giovanni Falcone and Paolo Borsellino.
Salvatore Riina was captured in 1993 and is currently serving multiple life sentences in jail.