MINNEAPOLIS – When Meredith Aby met with members of the Revolutionary Armed Forces of Colombia in 2006, she asked what it would take to get them to stop fighting. Jess Sundin did the same during her trip to Colombia 11 years ago. They returned and openly wrote and spoke about their experiences, while criticizing the U.S. government’s involvement in that country. FBI documents recently found by the anti-war activists suggest the trips may have started an investigation into apparent connections between local activists and radical groups in Colombia and the Middle East. One document says the probe expanded to include...