"Rao has brought discredit to the former Chief Minister by his alleged actions. Had she been alive and known about it, she would have permitted the raids and taken very severe action against him," he told reporters here.
Rao was trying to create "confusion" between AIADMK and the government officials, he said but did not elaborate.
Radhakrishnan pointed out that the raids at Rao's home and office in Chennai were only part of steps to eradicate corruption.
"The Income Tax officials are empowered to conduct raids," he said.
He said the Union government will not allow any person who commits wrong to escape.