Vigilance sources said the former Minister was summoned to the VACB office here and questioned for two hours in a case filed by Kerala Bar Hotel Industries Association leader and industrialist V M Radhakrishnan.
In his petition, Radhakrishnan has alleged irregularities in granting of bar licences by relaxing norms during Babu's tenure.
Meanwhile, Babu accused the state Vigilance and Anti- Corruption Bureau (VACB) of acting in an "extraordinary way" in the case and said he was not "expecting justice" from it.
Disclaimer: No Business Standard Journalist was involved in creation of this content