Kerala Chief Minister Pinarayi Vijayan on Sunday said that the biggest threat to the nation is the communal ideology that killed Mahatma Gandhi and called upon the people to take a pledge against communalism. In a tweet on the Mahatma’s 74th death anniversary, he said that the communal ideology that killed Mahatma Gandhi is still slaughtering people in the name of religion. He said that all forms of sectarian thoughts were gaining ground, shaking the very foundations of democracy and that innocent people were the victims. “Mahatma Gandhi was murdered by the very forces that still slaughter peo…