The radical activist group Black Lives Matter railed against the “white supremacist” institution of “policing,” decrying its roots in “racism” and “slave patrolling,” while attacking politicians who support “our killers,” in a series of tweets Thursday following President Joe Biden’s signing of an executive order on policing reforms.

In the wake of the president’s signing an order intended to improve accountability in policing, the official Black Lives Matter (BLM) Twitter account, which has over one million followers, expressed outrage over the fact that policing continues.

“Maintaining a white supremacist institution like policing costs Black lives,” the group wrote. “This continued commitment by politicians to support our killers makes them accessories to our demise.”