The Assassination Bureau (1969)

The Assassination Bureau has existed for decades (perhaps centuries) until Diana Rigg begins to investigate it. The high moral standing of the Bureau (only killing those who deserve it) is called into question by her. She puts out a contract for the Bureau to assassinate its leader on the eve of World War I.
Basil Dearden, Susan Dyson
Oliver Reed, Diana Rigg, Telly Savalas, Curd Jürgens, Philippe Noiret, Warren Mitchell, Beryl Reid, Clive Revill, Kenneth Griffith, Vernon Dobtcheff, Annabella Incontrera, Jess Conrad, George Coulouris, Ralph Michael, Katherine Kath, Eugene Deckers, Olaf Pooley, George Murcell, Michael Wolf, Gordon Sterne, Peter Bowles, William Kendall, Jeremy Lloyd, Roger Delgado, Maurice Browning, Clive Cazes, Milton Reid, Frank Thornton, Nita Lorraine
tt0064045