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He was speaking at a function organised on the occasion of joining the BDB by hundreds of leaders and workers of BNP, Awami League and Workers' Party of Rajshahi Metropolitan unit at K C Memorial Clinic in the city.
Prof Chowdhury said without the good will of the government it is not possible to check militancy.
The government must expel the 'accused ministers' from the cabinet and put them to trial to prove its sincerity, he added.
BDB Vice-president Dr Mozaffar Ahmed, Advocate Joynal Abedin Zaedi and Joint Organising Secretary Abdur Rauf Mannan also spoke on the occasion.