The Delta Factor (1970)

Action-packed espionage thriller based on a book by Mickey Spillane. A man who has been framed for a large-scale robbery escapes from prison, but is caught and given a choice between returning behind bars and working for the CIA. He is enlisted to rescue a scientist from a dictator-run island, disguised as a drug dealer with another agent posing as his wife, while simultaneously plotting to prove his innocence.