Ex Inspector General of Police Sundar Kumar Das joined Telugu Desham Party (TDP) today at Undavalli in Guntur district.He joined TDP in the presence of party president and AP cheif minister Chandrababu Naidu.After joining TDP he said that he was impressed by the development under TDP government in the past four years.Sundar Kumar Das served as Police officer on various ranks in both the telugu states till he retired.