DeRay Mckesson, lovingly profiled in the New York Times Magazine recently as one of a core group of activists who “have built the most formidable American protest movement of the 21st century,” is upset with President Obama tonight over his signing of Sen. Ben Cardin’s so-called “National Blue Alert” system, which creates a nationwide alert system to help capture anyone who harms or threatens to harm a police officer.

The Baltimore Sun reports that the law, introduced by Cardin in 2010, creates a system similar to the Amber alerts used to locate abducted children. “Seamless integration across the broadest audiences can expedite the capture of suspects and reduce the risk of additional victims,” said Cardin, who attended the signing.

Mckesson calls the legislation, which is named for ambushed New York City police officers Rafael Ramos and Wenjian Liu, “offensive” and proof that hate is organized in America.

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