BOSTON – Once again, they filed out of class. In a new wave of school walkouts, they raised their voices against gun violence. But this time, they were looking to turn outrage into action.

Many of the students who joined demonstrations across the country Friday turned their attention to upcoming elections as they pressed for tougher gun laws and politicians who will enact them. Scores of rallies turned into voter registration drives. Students took the stage to issue an ultimatum to their lawmakers.

“We want to show that we’re not scared. We want to stop mass shootings and we want gun control,” said Binayak Pandey, 16, who rallied with dozens of students outside Georgia’s Capitol in Atlanta. “The people who can give us that will stay in office, and the people who can’t give us that will be out of office.”

All told, tens of thousands of students left class Friday for protests that spread from coast to coast. They filed out at 10 a.m. to gather for a moment of silence honoring the victims of gun violence. Some headed to nearby rallies. Others stayed at school to discuss gun control and register their peers to vote.

Organizers said an estimated 150,000 students protested Friday at more than 2,700 walkouts, including at least one in each state, as they sought to sustain a wave of youth activism that drove a larger round of walkouts on March 14. Activists behind that earlier protest estimated it drew nearly 1 million students.

HeadCount, a nonprofit group that registers voters at music events, said 700 people had signed up to vote through its website during the past week. That’s up from just 10 people in the same period last year. Spokesman Aaron Ghitelman credited the uptick to walkout organizers who steered

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