The PGS was formed by a minority section of the erstwhile Indian National Congress in East Bengal at an 'Eastern Pakistan Political Convention' in Comilla on July 18, 1948.
For example Dhirendra Nath Dutta simultaneously served as the PGS general secretary as well as being the Deputy Leader of the Congress Parliamentary Party in the Constituent Assembly.
[1] PGS contested the 1954 East Bengal Legislative Assembly election under the banner of the Minority United Front, an electoral alliance formed together with the Pakistan Socialist Party and the Abhay Ashram.
[4] There were talks on electoral arrangement between the Minority United Front and PNC, but that did not materialize in any pre-poll pact and the two groups were the main competitors for the Caste Hindu seats.
[1] After the election the PGS leaders set up the United Progressive Party (UPP) as a new legislative faction.