Four white teachers at an East Falls elementary school have filed federal lawsuits claiming discrimination by a former principal who allegedly suggested that they were unfit to teach black students - the most recent episode in a racial tug-of-war that has dogged the school for several years. The teachers filed suits last week claiming that a former principal at Mifflin Elementary School, Charles Ray III, who is black, created a hostile environment at the school in 2008 and 2009. The suits allege that Ray forced white staffers to read an article that said that "white teachers do not have the...