Amar singh is a romeo of bollywood, his cassette of conversation with many leading actresses made a round in past. But unfortunately with his underworld connections that cassets never released by media. Mr. Bachchan should leave his company and be an independant man. Why he needs Amar Singh's company is known fact : 1. As he is connected to known criminal i.e. Dawood Ibrahim who finances many films through Amar Singh. 2. Amar Singh helps him in making money in stock markets where he manipulates many scrips especially related to anil ambani. If you have noticed how the prices of anil ambani group went up and came back sharply loosing small investors money.
3. Amitabh has rivalry with congress party which is against samajvadi party. So he is taking a digg at them through amar singh.