Kerala CM Pinarayi Vijayan condemned Southern Railway for making students sing the RSS anthem at the flag-off of Ernakulam-Bengaluru Vande Bharat Express on Saturday. Accusing the railway authorities of being subverted by 'Sangh Parivaar', he claimed that the institution is being used to sneak communal ideology into official events. "It's a blatant violation of constitutional principles," CM said.