President Obama to visit Cuba and Argentina: protests expected in Argentina. Rights Action supports family of slain environmentalist Berta Caceres. Chilean political exile murdered in Mexico. Mexican government probes 2010 massacre of 74 Central American migrants. Colombia limits press coverage of FARC rebels. Paramilitaries threaten Colombian civilians. Venezuelan opposition seeks President Maduro’s overthrow. Obama: “Venezuelan government threatens US national security.” Venezuelan-Colombian border briefly re-opened. Venezuelan opposition legislators increase privatization efforts. Argentine leftist leader still jailed after two months.