On Sunday afternoon, March 9, 1930, the city of Philadelphia witnessed what the Public Ledger called “one of the most amazing demonstrations of all trade union history,” when 22-year-old Carl Mackley was eulogized as a martyr for labor’s cause. Mackley, a knitter in the full-fashioned hosiery industry, had been gunned down three days earlier by armed strikebreakers hired by the owners of the Aberle Hosiery Mill, where a strike was in progress.