I think Mr.Sanjay Nirupam is giving a stupid reason for his resignation , because Shiv-Sena already was having this stand as Mumbai for Maharashtrains , which included people from other states already settled in Mumbai for 40-50 years.Mumbai is suffocating because of influx of migrants ,not just the people from north but from everywhere.States like UP and Bihar even after so many years are not able to provide jobs to their people then why Mumbai have to suffer for the incompetence of the governments in these states.Nirupam is also one of the North Indians who came to Mumbai to milk it without having any concern for Mumbai.If an opportunistic is leaving then I guess Sena is well off without him