Mission Impossible (1966)

An earthquake damages the U.S.'s Distant Early Warning (DEW) system and a Defense Department advisor, Whitmore Channing, steals plans from the Air Force identifying the weak spots. Channing has hid the information for pick-up by an enemy agent the next day, and the IMF must get the name and flight # of the agent from Channing. The IMF evacuate Channing's city block and drug him unconscious after a fake electrical shock, then wake him up after adjusting the clocks to a day later. He believes the information has already been picked up, an idea ""proven"" by a faked IMF invasion of the European People's Republic. But then the EPR invaders arrest Channing and put him on trial. Channing reveals the location of the drop to prove his ""innocence"", and then the IMF let him covertly know the whole thing is a fake. Channing calls his contact and mentions his name - the IMF get it via a tapped line and arrest the man before he can recover Channing's info.