City Congress chief Sanjay Nirupam led the march from Metro Cinema to Azad Maidan here.
Condemning the detention of party vice-president Rahul Gandhi, who was prevented by the police from meeting the family members of Grewal, Nirupam said the Congress will not tolerate this kind of "high-handed behaviour" of the Narendra Modi government.
"We will continue to discharge our responsibilities as an opposition party and the government has no right to prevent us from doing our duty," he said while accusing Prime Minister Modi of being "anti-soldier".
"The BJP government should have the decency to accept its mistakes," he said.
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