The blockade site was hardly 300 yards away from the venue of Punjab Deputy Chief Minister Sukhbir Singh Badal's rally.
Led by union leader Manjit Singh Manna, the activists blocked the road. They also alleged they were assaulted by police. Police, however, denied it.
Manna said their leaders were prevented from meeting Sukhbir whom they wanted to present a memorandum. But police detained the delegation.
City SHO Ravinder Singh denied any arrest and detention.