I’m not too sure how active they are these days but there is  "The Invisible Colours of Benetton: awareness campaign" (the website seems to be missing some content now)

The Mapuche themselves are also very active and I’m certain they’ll organize an int’l camapign if they feel the need to… there’s no way they’re going to roll over like Benetton wants them too (some recent media coverage, in spanish)

Beyond that, I’m not too sure what else to add, but the Mapuche International Solidarity Network may have more info, mapucheinternationalsolidarity@gmail.com