Shirodkar began participating in the Goan liberation movement in 1939. Since that year, he would openly hoist the Indian tricolour at
Old Goa every 26 January. He was a founding member and subsequently the President of the National Congress (Goa) Executive Committee. During this period, he maintained contact with Indian independence activists such as
Senapati Bapat in
Maharashtra, reportedly supplying him with weaponry. In the 1940s, he was involved in procuring arms and ammunition from Portuguese storehouses for nationalists. After a failed raid on supplies stored at Tambdi Mati, which resulted in the arrest of some associates, Shirodkar moved to
Pune. He served as the deputy editor of the newspaper
Sakal in Pune before moving to
Mumbai, where he worked as a news editor for the daily
Navshakti. During his time in Mumbai, he wrote research articles focusing on Goan history and liberation. He also served as the Marathi-Portuguese co-editor of the periodical
Aavese and was active on the executive committee of the Goa Youth League. Furthermore, he held the position of Secretary for both the
Congress Socialist Party and the Samyukta Maharashtra Parishad (United Maharashtra Council). To dedicate himself fully to the independence movement, Shirodkar resigned from his journalistic career and resumed activities with the National Congress (Goa). The Portuguese authorities arrested him on 25 September 1946, sentencing him to four months in Aguada Central Jail. During this incarceration, he undertook a 14-day hunger strike to demand treatment as a
satyagrahi. Upon his release, he organized a session of the Goan Congress at Karamle (Karambolim) on 15 May 1947, where the organization adopted a constitution and passed resolutions demanding full independence and integration with India.
Exile in Africa Following his re-arrest on 16 December 1947, Shirodkar was tried by a Regional Military Court and sentenced to 15 years in exile along with associates including Vinayak Mayenkar, Guilherme de Souza Ticlo, and Nilkanth Karapurkar. He was deported to
Angola, where he was detained at Fort Roçadas. He later spent time in Sá da Bandeira (now
Lubango) between 1 June 1952 and 12 May 1956. Although eventually released from strict confinement, he was forced to remain in exile within Angola. To sustain himself, he conducted private tuition classes and worked as a journalist. Due to his participation in local political movements and an uprising for independence in Angola, he was imprisoned again. The Portuguese authorities termed him a "mentor" of the nationalist movement in Angola and arrested him on 6 February 1961. He was held in solitary confinement at the
São Paulo fortress for five months. During his exile, he also served as a co-editor for the
Jornal de Angola in
Luanda. Despite his imprisonment, Shirodkar held a deep affection for the country, stating in his autobiography, "The people of Angola are so wonderful. If there is such a thing as rebirth, I would want to be reborn in Angola." After nearly 15 years of imprisonment and exile, Shirodkar was sent to
Lisbon. He eventually returned to India via
Karachi, arriving in May 1962, six months after the
Annexation of Goa. == Political career in liberated Goa ==