NBC's Gadi Schwartz talked to marchers in Washington D.C., and to American University Professor Jane Hall about the characteristics of effective protests.
Round the world when people feel strongly, they gather together and take to the streets.
But do protest marches really work? NBC's Left Field film unit went to find out.
There are certain characteristics of effective protests claims American University Professor Jane Hall.
She said there are five ingredients for a successful march:
Watch the video for the full report