what was a result of the haymarket square riot
A harsh anti-union clampdown followed the Haymarket incident.
Haymarket affair
A harsh anti-union clampdown followed the Haymarket incident. 
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Haymarket affair [SEP] Aftermath and red scare
A harsh anti-union clampdown followed the Haymarket incident. There was a massive outpouring of community and business support for the police and many thousands of dollars were donated to funds for their medical care and to assist their efforts. The entire labor and immigrant community, particularly Germans and Bohemians, came under suspicion. Police raids were carried out on homes and offices of suspected anarchists. Dozens of suspects, many only remotely related to the Haymarket Affair, were arrested. Casting legal requirements such as search warrants aside, Chicago police squads subjected the labor activists of Chicago to an eight-week shakedown, ransacking their meeting halls and places of business.