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Gregory Peck, Christopher Plummer, and John Gielgud all in one film? Yes, please.
I came across this 1981 made-for-TV movie during my NaNoWriMo research on WWII. Necessarily, I read about a number of fascinating resistance groups. There was Dietrich Bonhoeffer and the Valkyrie Plot, Sophie and Hans Scholl and the White Rose, Corrie ten Boom (of The Hiding Place fame,) and, one of most fascinating, Hugh O'Flaherty, the Vatican Pimpernel.
The Scarlet and the Black is a dramatization - no, that's the wrong word - it's an account of Monsignor O'Flaherty's many adventures during the war. O'Flaherty (Gregory Peck) was an Irish priest, an excellent golfer, and a master of disguise. He saved over 6,500 people during the war, earning him the nickname of "The Scarlet Pimpernel of the Vatican." He even had his own personal Chauvelin to play arch-nemesis, SS-Obersturmbannfuhrer Herbert Kappler (Plummer), a callous war-criminal.