The strike united workers from more than 51 different nationalities many of whom knew little to no English. A large portion of the striking workers, including many of the leaders of the strike, were Italian immigrants. Carried on throughout a brutally cold winter, the strike lasted more than two months, from January to March, defying the assumptions of conservative trade unions within the American Federation of Labor (AFL) that immigrant, largely female and ethnically divided workers could not be organized. In late January, when a striker, Anna LoPizzo, was killed by police during a protest, IWW organizers Joseph Ettor and Arturo Giovannitti were framed and arrested on charges of being accessories to the murder.