Italy’s largest mafia trial in three decades has begun, with 900 witnesses testifying against more than 350 people, including politicians and officials charged with being members of the powerful ’Ndrangheta. A high-security 1,000-capacity courtroom with cages to hold the defendants has been built by Italian authorities in the Calabrian city of Lamezia Terme. Despite its symbolic importance, the opening day was largely procedural, with Judge...