The shah regime had always sent Imam Khomeini into exile into Turkey.
Some days or weeks later, the western-backed regime also decided to send Imam’s elder son Mostafa Khomeini to join Imam.
Hajj Mostafa, who had brought basic Islamic sources from Iran, started living alongside Imam in Turkey.
The both some months later migrated to the holy city of Najaf
(Extracted from a collection of memoirs about Imam)