CHENNAI: A noted RTI activist lodged a complaint with autorities including State Information Commission, Director General of Police, and other authorities seeking protection to him since he is facing a threat from realtors and officials of civic authority. P.Kalyanasundaram, social worker, is also known as "Thagaval Thattha'. In his identical letters to all including police, he is obtaining information under RTI and serving to public cause. He claimed that a construction company has been building apartment in his area flouting norms of Chennai Metropolitan Authority and a few officials of Chennai Corporation also were also acting upon his complaints. He alleged that unknown persons were following him and watching his residence. Mr. Kalyanasundaram claimed that his life was under threat by unknown persons.