[4] During the 1950s, construction of the Kennedy Expressway erased about half of the old, run-down market square area, and in 1956 the statue was moved to a special platform built for it overlooking the freeway, a few blocks from its original location.

[5] For another three decades the statue's empty, graffiti-marked pedestal stood on its platform sat in a run-down area overlooking the expressway, where it was known as an anarchist landmark.

[5] On June 1, 2007, the statue was rededicated at Chicago Police Headquarters with a new pedestal, unveiled by Geraldine Doceka, Officer Mathias Degan's great-granddaughter.

[2] In 1992, the site of the speakers' wagon was marked by a bronze plaque set into the sidewalk, reading: A decade of strife between labor and industry culminated here in a confrontation that resulted in the tragic death of both workers and policemen.

Also, there is a quote attributed to Spies, recorded just before his execution by hanging: "The day will come when our silence will be more powerful than the voice you are throttling today."

On the top of the monument, a bronze plaque contains text of the pardon later issued by Illinois governor John Peter Altgeld.

[8] The Haymarket Martyrs' Monument was designated a National Historic Landmark by the United States Department of the Interior in 1997.

[8] Chicago labor supporters called for a park at the site of the Haymarket riot as early as 1985 in commemoration of its 100th anniversary.