There was a No Borders camp at the US-Mexico border for five days in 2007! I wish I had been there. Though they did get beat up pretty bad by the US Border Patrol on the last day. Check out the videos. There is also a series of three videos on YouTube summarizing the entire event:

Part 1: https://www.youtube.com/watch?v=ccePCNfEsQ0
Part 2: https://www.youtube.com/watch?v=yNJxYgEduSs
Part 3: http://www.youtube.com/watch?v=l9wGm6VA208&feature;=youtu.be