 Complete the following phrase:  In September 2006, the unification congress of MCPIU was held in Chandigarh. 345 delegates from Punjab, West Bengal, Andhra Pradesh, Bihar, Rajasthan, Uttar Pradesh, Tamil Nadu and Kerala participated. The rally held ahead of the congress, which gathered around 5000 demonstrators, was addressed by B.N. Reddy, the chief commander of the 