Progressive social movements are attracted to actors and causes they perceive as underdogs, says expert. Digital-savvy activists with national environmental charities were a driving force of Monday’s pro-Palestinian protests at federal constituency offices. They used old-fashioned sit-ins to promote their campaign for a ceasefire in Gaza. “What was new was the particular cause the protests were dedicated to, and the particular messages that were communicated,” said University of B.C. sociology professor David Tindall, who analyzes protest movements. The protesters, who said they were with the Palestinian Youth Movement, targeted the offices of 17 members of Parliament across the country, including...