BBC NEWS | UK | Magazine | Why do US pickets walk in circles?
"I believe that the reason that picketers walk either in a circle or patrol back and forth is so that they can permissibly walk in front of a gate or entrance of a picketed establishment without blocking or impeding ingress or egress, which is prohibited by law."

En canvi, aquí les manifestacions busquen bloquejar-ho tot. El que fan les diferències culturals. Potser per això ells són potència i nosaltres no? Pel respecte a la llei?