MELBOURNE, Australia — Families of victims of the recent Sydney massacre that targeted a Jewish festival released an open letter on Monday calling for more federal action to investigate a rise in antisemitism and the security failures behind Australia’s worst mass shooting in three decades. Two gunmen are accused of shooting 15 people dead and wounding 40 others in an attack on a Hanukkah festival on Bondi Beach on Dec. 14. In an open letter to Prime Minister Anthony Albanese, 17 families of the dead and wounded called for a federal inquiry known as a royal commission to investigate a...