In 1966, Alamgir came back to Dhaka. The Ayub government imprisoned him for his involvement with the leftist movement. Later, he started his professional life as a journalist. With the start of the war of independence in 1971, he joined the Swadhin Bangla Betar Kendra as the chief of its English section. He also worked as the chief reporter of the Bangladesh government in exile. This period also marks the start of his directorial life with the making of documentaries.