Delwar Hossain Sayeedi is at the forefront of alleged war criminals who it is widely believed were active collaborators with the Pakistan Army during the Bangladesh Liberation War in 1971. This included organizing and founding the vigilante Razakar army which was guilty of widespread torture, murder and rape of Bengali nationalists, as well as preparing lists of prominent Bengalis (primarily Hindus and intellectuals) for subsequent arrest and murder by the Pakistan army. Documented records of Sayeedi's public statements during 1971 certainly provide evidence of his political stance opposing Bangladesh independence and supporting the actions of the occupying Pakistan Army (see, for instance, reference books such as Ekattorer Ghatok Dalalra Ke Ki Bolechen (Speeches and Letters of the 1971 Collaborators) published by the Ghatok-Dalal Nirmul Committee in 1996). On August 14, 1971, for instance, at the height of the Bangladesh Liberation War, he is reported by the DAILY SANGRAM newspaper to have stated, "Pakistan is here to stay while humanity survives. Those who oppose the existence of Pakistan (ie, Bangladeshi freedom fighters) will burn in hell along with all the other non-believers (ie, non-Muslims)"

On March 26th, 1995, the National Coordination Committee for Restoration of the Spirit of the Liberation War and Elimination of Killers and Collaborators of 1971 found Delwar Hossain Sayeedi guilty of war crimes. The coordination committee urged the government to set up a special tribunal and try him under the International Crimes (Tribunals) Act 1973. However, no action was taken by the government.