This was his most famous and influential work and laid out his ideas on governance at that time.
Logically, in the 1970s, as contrasted with the 1940s, he no longer accepted the idea of a limited monarchy under the Iranian Constitution of 1906-1907, an idea that was clearly evidenced by his book Kashf-e Asrar.
In his Islamic Government (Hokumat-e Islami) — which is a collection of his lectures in Najaf published in 1970 — he rejected both the Iranian Constitution as an alien import from Belgium and monarchy in general.
He believed that the government was an un-Islamic and illegitimate institution usurping the legitimate authority of the supreme religious leader (Faqih), who should rule as both the spiritual and temporal guardian of the Muslim community (Umma).
Imam Khomeini spent over 14 years in exile, mostly in the holy city of Najaf in Iraq. Initially, he was sent to Turkey on 4 November 1964, where he stayed in the city of Bursa for less than a year.
He was hosted by a Turkish Colonel named Ali Cetiner in his own residence, who couldn't find another accommodation alternative for his stay at the time.
Later in October 1965 he was allowed to move to Najaf, Iraq, where he stayed until being forced to leave in 1978, after then-Vice President Saddam forced him out (the two countries would fight a bitter eight year war 1980-1988 only a year after the beginning of Imam Khomeini’s leadership in Iran and the start of Saddam Hussein’s term in Iraq) after which he went to Neauphle le Château in France.
It is worth mentioning that two weeks after the Shah fled Iran on January 16, 1979, Imam Khomeini returned to Iran triumphantly, on February 1, 1979, invited by the anti-Shah revolution which was already in progress.
Conservative estimates put the welcoming crowd of Iranians at least three million. When Imam Khomeini was on plane on his way to Iran after many years in exile, a reporter, Peter Jennings asked him: "What do you feel?" and surprisingly Imam Khomeini answered "Nothing!"
In a speech given to a huge crowd on the first day of returning to Iran, Imam Khomeini attacked the government of Shapoor Bakhtiar promising "I shall punch their teeth in." He also made a variety of promises to Iranians for his coming Islamic regime: A popularly elected government that would represent the people of Iran.