Several Opposition MPs, including Congress president Mallikarjun Kharge and former party chiefs Sonia Gandhi and Rahul Gandhi, staged a demonstration on Wednesday.
Members of the Congress, DMK, TMC, Left parties, and others assembled near the Makar Dwar, holding posters and placards criticising the new labour policy framework.
The Centre had notified the four labour codes last month, bringing to completion reforms pending since 2020.