Wednesday morning, mannequins that were smeared with blood were laid out in front of Rome's municipal buildings as a threat to Kyenge, the integration minister, ANSA reported.
"Insults, provocations, threats beyond imagination are slipping dangerously towards a sad routine is not worthy of our Italy,'' Kyenge said on Twitter.
ANSA said members of the far-right Forza Nuova movement set out the mannequins to protest the minister's proposal to extend citizenship to the Italian-born children of migrants.
The act was the latest protest against Kyenge, who has been harshly criticized for her race and her stand on immigration.
Recently, an anti-immigrant former political activist suggested on Facebook that someone kill Kyenge.
In August, someone scrawled "Kyenge-orangutan" in large handwriting on a garage door, ANSA reported.
A senator from the anti-immigrant Northern League previously compared Kyenge to an orangutan.