SEATTLE - Starbucks Corp. has fired the co-founder of a union claiming to represent employees at six of its Manhattan coffee houses. Daniel Gross, a barista and organizer for IWW Starbucks Workers Union, a branch of the Industrial Workers of the World, said Monday that he is challenging his termination, which followed a company investigation into an allegation that he made a threatening remark to a district manager at a recent union rally. Gross, who has led union organizing efforts at Starbucks for the past three years, countered that he was simply making a statement of solidarity when he told...