Professional Anarchists is an ongoing photo series by Lisa Allen that aims to capture the peaceful demonstrations against the Trump administration and to meet the ordinary people behind them—to learn why they march and to put a face to the new resistance movement. On a sweltering Saturday afternoon that tied a local heat record, tens of thousands of people from across the country gathered in Washington, D.C., for the Peoples Climate March. Marking President Trump’s 100th day in office—and a second consecutive weekend with a high-profile protest—the movement took issue with the administration’s rollbacks of environmental protections and ongoing efforts...