Her remarks come on a day when the party petitioned the Election Commission for cancellation of two votes of its "disgruntled" lawmakers during Rajya Sabha election in Gujarat.
"Congress must always defend the liberty and freedom of individual and institutions. Anguished by assault on freedom; self-appointed vigilantes are a threat to liberty and enemy of pluralism and diversity," Ms Gandhi said at the meeting.
Party vice-president Rahul Gandhi skipped the special meeting of the CWC on the 75th anniversary of Quit India movement as he is down with fever.
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