They planned to harvest cocoa beans.

About eight men, women and children were going to work in the fields. Some even started a seven-hour hike into Colombia's countryside.

But their attempt to gather food came to a sudden and violent end.

The families were viciously attacked and killed by men yielding machetes.

"They killed eight people, three of whom were children, with machetes," said Janice Gallagher. "For me as a U.S. citizen -- if I could do anything to stop that from happening again, I felt a moral imperative to do so."

The murders prompted Gallagher, 30, to spend the past year as a human-rights activist in Colombia, working for the nonprofit and interfaith organization, Fellowship of Reconciliation.