Calautta based WBML (West Bengal Muslim League) was formed on 21 Jan 1909 with Prince Jehander Mirza as president and Syed Shamsul Huda as Secretary.
Following the annulment of the partition ob Bengal both the league were amalgamated into one on 2 March,1912 with Nawab Salimullah as elected President while Nawab Ali Choudhury and Zahid Surawardy as Secretaries, BarristerAbdur Rasul as elected treasurerand Abul Kasem as Joint Secretary. By 1946, BPML suceeded in building itself up the most effective organisation of the Muslims of Bengal . In the election of 1946, it captured 110 seats among117 reserved seats in Muslim Constituencies of Bengal.
This was possible in the course of the office hold of Bengal Ministry, after the submission of resignation of Fazlul Huq to John Herbert who himself drafted the resignation letter, in 1943. The leadership was taken by Khwaja Nazimuddin of BPML as cheif Minister.