What is Patra Chawl Land Scam, know why MP Sanjay Raut under ED`s radar?

ED has taken major action against Sena leader Sanjay Raut in Patra Chawl scam case. ED has taken Sanjay Raut into custody. When Raut was brought out after being taken into custody, he was seen waving his saffron gamcha. Know in this report what is the Patra Chawl Land Scam?