Seven African-American Fox News employees will reportedly join a racial discrimination lawsuit next week, alleging that the network’s former comptroller Judy Slater subjected them and others to racial harassment. In addition to Slater, who was fired in February, the lawsuit names Tammy Efinger, the network’s accounting director. “Not once did Ms. Efinger step in or attempt to interfere with Ms. Slater’s outrageous conduct,” lawyers representing the employees wrote in a letter to Fox lawyers, adding that Efinger “chose to laugh or giggle following Ms. Slater’s vitriol. The letter also alleged that Slater called for arm wrestling matches between black and white employees. The lawsuit was initially filed last month.