"We had gone to submit a memorandum to senior BJP leaders against the passage of the bill in Rajya Sabha as the party's national president Nitin Gadkari, too, was present when the incident happened," convenor of Sarvjan Hitay Sanrakshan Samiti, Shailendra Dubey, said.
The BJP brass is in the city to preside over former UP Chief Minister Kalyan Singh's re-entry into the party.
Dubey alleged that former state president Surya Pratap Shahi had instigated BJP workers to carry out an unprovoked attack on the employees' group.
Dubey said that the incident took place in the presence of Gadkari, state president Laxmi Kant Bajpai and senior leader Kalraj Mishra.
"I have given a call for boycott of work and will hold a protest meeting in the afternoon," he said.