The state Board of Examiners for Nursing on Wednesday revoked the licenses of three nurses and disciplined six others, mostly for alcohol and drug abuse violations. The board revoked the registered nurse (RN) license of Kathryn Y. Ford of Wilton after finding that her continued practice as a nurse posed a threat to public safety, according to a memorandum of decision. Ford’s license had previously been suspended for using marijuana, cocaine and heroin to excess from January 2017 to August 2018. The licensed practical nurse (LPN) license of Presley Eze of West Hartford, who has a long history of disciplinary actions, was also revoked. State records show that Eze was high on PCP in 2011 when he brandished a sword outside the Trader Joe’s store in West Hartford, and he has been arrested four times since then, records show.