None of the workers were arrested as they disbursed peacefully after raising slogans against Swamy, police said.
The case is based on a private criminal complaint by Swamy against Congress President Sonia Gandhi and her son Rahul, charging them with cheating, conspiracy and criminal breach of trust.
The mother-son duo of Sonia and Rahul Gandhi was granted bail by a local court in New Delhi today that rejected Swamy's opposition to the relief for them on the ground that they were influential and could flee the country.