The date had its origins at the 1885 convention of the American Federation of Labor, which passed a resolution calling for adoption of the eight-hour day effective May 1, 1886.[9] While negotiation was envisioned for achievement of the shortened work day, use of the strike to enforce this demand was recognized, with May 1 advocated as a date for coordinated strike action.[9] The proximity of the date to the bloody Haymarket affair of May 4, 1886, further accentuated May First's radical reputation.[citation needed]