A leader of Australia's Roman Catholic church has barred a group of liberal followers from using a church venue to hold a conference at which a gay rights activist was to speak. Cardinal George Pell, who has refused to give communion to gays and once called homosexuality "a greater health hazard than smoking," said it would be unsuitable for the liberal Australian Reforming Catholics group to meet on church property. It was not immediately clear what the gay activist planned to speak about. Pell also forbade liberal Bishop Pat Power from celebrating Mass at the event, which has been moved...