A firebrand conservative who became one of Pope Francis' most ardent critics has been excommunicated by the Vatican.Archbishop Carlo Maria Viganò, who once served as the Vatican's ambassador to the U.S., was found guilty of schism. The Vatican's doctrine office imposed the penalty after a meeting of its members on Thursday, a press statement said Friday.The office cited Viganò's "refusal to recognize and submit to the Supreme Pontiff, his rejection of communion with the members of the church subject to him and of the legitimacy and magisterial authority of the Second Vatican Council," as its reasoning for the ruling. (snip)...