LOS ANGELES — The retirees gathered at 8 a.m. near the G Line station in Canoga Park, impossible to miss in their neon yellow vests. They clutched trash bags and surveyed the expanse of trash-filled sidewalks and gutters before them.

Group leader Jill Mather, who walks and talks with the efficiency of a military general, laid out the task ahead: Clean a milelong stretch of Sherman Way.

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