Why anna hazare kept quite for a long time and now rake up the corruption issue . is it because of political i?

Anna Hajare has been raising the issue of corruption long since. He was never quiet but step by step he was proceeding towards his aim. He struggled for implementation of Right to Information Act and also raised his voice in Maharashtra against the corruption of politicians at number of times. Recent fast done by him was not his first fast but at so many times he has used this weapon to compel the Govt. for taking action against corruption. He is not connected with any political party. So where question arises of getting political advantage.