Following in the footsteps of police in Pittsburgh and New York City, Chicago officials say they are ready to deploy the dreaded LRAD noise weapon at NATO protesters this May. The LRAD is a noise machine that can damage hearing, and is deployed both to convey messages to large crowds and to rapidly disperse them. It basically amounts to a free speech killer.

Here are some clips of police deploying the LRAD during the G20 summit in that city back in 2009. It's pretty creepy.

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Boston Police brought an LRAD out the night they evicted Occupy Boston from Dewey Square, but didn't use it.