The cartoonist depicted Governor John P. Altgeld's pardon in this way because the then Governor of Illinois was regarded as "The Friend of Mad Dogs."
The depiction in the cartoon showed Governor Altgeld pardoning the Hay-market prisoners. Most of the Hay-market rioters were German anarchists. Unfortunately, Governor Altgeld was a German-born American.
While the Hay-market riot of 1886 triggered fears of anarchism imported from Germany, the riot also set the labor movement back because it brought about its castigation.
Thus, the fact as presented helps the historical understanding of the cartoonist's depiction of Governor Altgeld as a friend of anarchists.
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