'The yuvraj of Congress (Rahul Gandhi) is very vocal on the corruption by Mayawati. However, he is not saying anything on the corruption by his own government,' Thackeray said in an editorial party mouthpiece Saamna. ""His mummy (Sonia Gandhi) is also quiet on the issue. The prime minister is also not opening his mouth. The truth is hidden in the silence,' the Sena chief added.