“There are peaks of mobilization — usually after a mass shooting — but the organizations tend to come and go and are hard to sustain,” said UC Irvine sociology Professor David Meyer, author of “The Politics of Protest: Social Movements in America.” “The problem,” he said, “is to get anything done in the U.S., you need to sustain it over a long period of time.”

For the full story, please visit https://www.sfchronicle.com/crime/article/A-mass-movement-for-gun-control-laws-will-take-14282717.php?psid=g65cD.