ETCHUM, Idaho, March 22 — A yearlong F.B.I. surveillance of John Kerry's antiwar activities in the early 1970's was "a badge of honor" and an encroachment on civil liberties that has echoes in the presidential race, a Kerry spokesman said on Monday. Newly disclosed F.B.I. files reveal that the bureau's agents and informants closely followed Mr. Kerry and other leaders of Vietnam Veterans Against the War, infiltrating meetings, recording speeches and filing reports to Director J. Edgar Hoover and President Richard M. Nixon. Advertisement Mr. Kerry, who joined the antiwar group's leadership in late 1970 — months after leaving the...