Congress MP Rahul Gandhi was detained amid the party's massive protest against rising prices, unemployment and GST hike on essential items.
Wearing black clothes, Congress leaders staged a protest on Friday as they marched towards the Rashtrapati Bhawan as part of their nationwide stir.
Several others MPs including Shashi Tharoor have been detained.
"Again today, Congress MPs denied democratic right to protest against price rise, unemployment and GST. Bundled into police vans at Vijay Chowk. It's clear, only those who are afraid try to instill fear!" party leader Jairam Ramesh said in a tweet.
Addressing a press conference ahead of the protest, Rahul said India is witnessing the "death of democracy" and anybody who stands against the onset of dictatorship is "viciously attacked".
The party is also protesting against the alleged misuse of probe agencies by the government to target its leaders.
The Delhi Police had denied permission to stage a protest in the national capital as prohibitory orders are in place. The Congress workers also planned to gherao Prime Minister Narendra Modi's residence as part of the protest.
