5. Rameshwar Nath Kao, Spymaster He was the first chief of RAW from 1969 to 1977.
He was an intensely private man, no one knew his whereabouts.
He was photographed only twice in public throughout his life.
He was considered among top 5 intelligence chiefs of his time.
He played a very important role in the separation of Bangladesh from Pakistan, and merger of Sikkim into India.
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