The Department Of Defense has been working on what they call "The Cheetah Robot" for "Emergency responses, Humanitarian efforts, and other defense missions." They are now able to make it run faster than the World's Fastest Man, Usain Bolt, reaching a speed of a little over 28 MPH. Right.... This is what I'm envisioning for this particular form of evil, just because I'm a paranoid son of a bitch. All this thing needs is a giant metallic head with titanium jaws and serrated teeth. Add glowing red Terminator eyes and you have the perfect cold, cruel, unstoppable attack dog to be sicked on dissenters of the current regime. Able to destroy protests in a matter of minutes. We will sell millions of these to Dictators all over the world. Vladimir Putin will come up with the Russian version but it will have a grenade launcher. The Chinese will advance it by giving it a taste sensor for blood.
We will start seeing them at Occupy protests and Political conventions. Soon after that they will be unleashed on the streets of America's cities to patrol for crime and dissent. At first they will be controlled by special technician/Judges from a bunker who will be able to review laws and expedite executions, tearing "perpetrators" to pieces and leaving piles of flesh and bone to remind the public who is Boss. Eventually, they will be programmed to perform these functions on their own.
The only positive I see coming out of this is their use to quell the impending Zombie Apocalypse.