In 1941, in what is considered to be Imam Khomeini's first public political statement, Imam wrote and published a book entitled Kashfol-Asrar in which he revealed the crimes of the 20-year monarchy of Rida Shah.
The book is essentially a detailed, systematic critique of an anti-religious tract, and in defending Islam and spirituality, Imam refutes the deviatory sophisms employed by the author.
It is in this book that the idea of an Islamic government, and the need for an uprising to establish this, is propounded.