WASHINGTON (Reuters) – Law enforcement agencies are readying for a possible spike in violence when the U.S. Supreme Court issues its highly anticipated abortion ruling, including by racist extremists, Axios reported on Wednesday, citing a Department of Homeland Security (DHS) memo. Officials are probing threats on social media targeting justices on the nation’s top court as well as those directed at court staff, churches and abortion clinics. A leaked draft opinion in an abortion-related case before the court that could drastically scale back abortion rights, has triggered a wave of protests o…