RIO DE JANEIRO — The resounding defeat of a proposed ban on the sale of guns and ammunition in a referendum Sunday reflected one of the most sudden shifts in public opinion ever recorded in Brazil, and some fear that it could usher in more conservative, authoritarian security policies that trample human and social rights. The firearms ban was voted down by almost two thirds — 64 percent — of voters, an even more sizeable majority than was predicted by polls... (GunPolicy.org)