Good

They were blocking a wall to get access to the dam...nice planning...

Just as your neighbor can't build a wall across a common access, neither can anyone do the same across public land...good...

If they are going to do this, they need to follow the laws...

The organization was created as the International Boundary Commission by the Convention of 1889 between the United States and Mexico. It was given its present name under the 1944 "Treaty relating to the Utilization of Waters of the Colorado and Tijuana Rivers and of the Rio Grande".
I cannot see how a wall preventing the illegal invasion of our country relates to the waters of Colorado and some other rivers.

SUCH a complicated issue! On one hand, illegal immigrants create many problems for communities along the border. (Trash, robberies, a huge load on social services....) On the other hand, these are people in genuine need, looking for jobs. It's never going to end, either, not as long as corruption and economic imbalance persist around the world.