VANCOUVER — The Church of Jesus Christ of Latter-day Saints is suing the religious leader of a small polygamous sect in British Columbia, alleging Winston Blackmore has violated the church's trademarks and is attempting to portray himself — and his controversial community — as a part of mainstream Mormonism. The Salt Lake City-based church has filed a notice of claim against a corporation set up by Blackmore, who is one of two leaders in a commune in southeastern B.C. known as Bountiful. Blackmore and his followers practise a fundamentalist form of Mormonism that still holds polygamy as a tenet of...