Mamata Banerjee has called the controversy over a newspaper ban in libraries a small matter and the handiwork of a mischievous section. But she has partially bowed to public pressure and included one English daily to the list of newspapers state-run libraries may keep. "It is a small matter. It has become an ego issue for some. It is very unfortunate, unfair. A systematic move to malign our government. One mischievous section is playing a dirty game," the West Bengal Chief Minister said.