Nancy Lanza, whose gun collection was raided by her son Adam for Friday’s massacre at Sandy Hook school, was part of the “prepper” movement, which urges readiness for social chaos by hoarding supplies and training with weapons. “She prepared for the worst,” her sister-in-law Marsha Lanza told reporters. “Last time we visited her in person, we talked about prepping – are you ready for what could happen down the line, when the economy collapses?”