Led by former Haryana Chief Minister Bhupinder Singh Hooda, the party submitted a memorandum to the Governor, urging that the report be made public.
The party alleged that the state government was training guns on Hooda to divert the public wrath it faced over its "inept" handling of the Jat agitation.
"This government formed the Prakash Singh Committee. What is the reason that they are not making the report public," senior Congress leader and former Haryana Assembly Speaker Kuldeep Sharma told reporters after a party meeting convened by Hooda.
Thirteen of the 15 sitting Congress MLAs including Hooda, 65 former MLAs, six ex-MPs, Congress' Rohtak MP and PCC members took part in the meeting.
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However, state Congress legislature party leader Kiran Choudhary was not present.
Talking about the Prakash Singh Committee report, Hooda said, "The government is hiding facts. The truth must come out. Officers are being made scapegoats. Why won't political masters be held responsible, those who were at the helm."