Union Minister M Venkaiah Naidu has said, some forces are trying to pollute the minds of the students in higher educational institutions across the country. He was referring to recent developments in Hyderabad Central University and Jawaharlal Nehru University. At a meeting organised by the BJP on 'unity of nation' in Vijayawada yesterday, Mr Naidu said, 735 of the 740 universities are peaceful. He said, recent incidents erupted in five universities where the Left Parties are trying to create trouble.