Italian police arrested a nun known for her prison work and 24 other people on Dec. 5 as part of an investigation into the ‘Ndrangheta Mafia in the northern city of Brescia, three sources with direct knowledge of the matter told Reuters. They said Sister Anna Donelli, a volunteer in Milan’s San Vittore prison, is suspected of Mafia collusion and of acting as a go-between for the criminal group and its jailed gang members.