mem286

Protest is ok, and for piqueteros I've seen it as "piqueteros" or "pickets". Have a look at these links:
http://news.bbc.co.uk/2/hi/americas/2543753.stm
http://news.bbc.co.uk/2/hi/americas/2543753.stm
http://protests-argentine.feed24.com/go/52173576
http://protests-argentine.feed24.com/go/52120105
http://news.bbc.co.uk/2/hi/americas/7327476.stm

You'll find lots of examples in those links!!

Hope it helps!

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All that's to come and everything under the sun is in tune, but the sun is eclipsed by the moon.