An "alliance of subversion" was responsible for violence on university campuses, Finance Minister Arun Jaitley said on Saturday, drawing a prompt rebuttal from the Congress which questioned the former student leader's track record in return. Contending that separatists and "the ultra-Left" were speaking the same language in certain campuses, Mr Jaitley said they must allow others with different opinions to speak. The remarks came amid a raging row over the violence at Delhi's Ramjas College over an invitation for a seminar to Jawaharlal Nehru University student Umar Khalid, who had been accused of sedition over an event last year where anti-India slogans were allegedly raised.