Coca Cola's bottling partner in Colombia was, quite famously, accused of using mercenaries to murder labor organizers in the early 00s. http://www.nytimes.com/2001/07/26/world/union-says-coca-cola...

Similar accusations were made against Coke's Guatemalan bottler a few years back. Of course, about a hundred years ago it wasn't uncommon for companies to use hired muscle to harass, beat, and even murder labor activists in the United States. https://en.wikipedia.org/wiki/Ludlow_Massacre