I found the pic on a random website
but it was an 'artistic' student protest outside the Cambridge branch of Gap a while back.

I went out shopping and passed them acting out the horrors of sweat-shops or somesuch- when I came back half an hour later they were exchanging increasingly heated insults with a group of Animal Rights protesters who wanted to use the same spot to protest Gap's use of animal products. Sadly I had to go, so I didn't get to see if it got violent ;)
( Shrub Rocketeer is a twisted emotional husk, Wed 28 Jul 2004, 21:02, archived)