Concepcion Picciotto, the protester who maintained a peace vigil outside the White House for more than three decades, a demonstration widely considered to be the longest-running act of political protest in U.S. history, died Jan. 25...She was believed to be 80.

Ms. Picciotto — a Spanish immigrant known to many as “Connie” or “Conchita” — was the primary guardian of the anti-nuclear-proliferation vigil stationed along Pennsylvania Avenue.