Italian authorities have seized assets and businesses worth more than €200 million as they tighten the net around money allegedly laundered from drug trafficking tied to a notorious mafia boss. Matteo Messina Denaro, arrested in 2023 after three decades as a fugitive, had long been one of the defining figures of the Sicilian Cosa Nostra’s violent campaign against the Italian state in the 1980s and 1990s, a period that included the murder of prosecutor Giovanni Falcone. Known as “U Siccu,” or “the skinny one,” Messina Denaro…