ALBANY — A Fulton County man linked to white supremacist groups is among three men indicted earlier this week, accused of conspiring to commit an armed bank robbery in Johnstown, federal prosecutors said Wednesday. Gloversville resident Luke Kenna, 43, along with Nassau County resident Michael Brown Jr. and Pennsylvania resident Brian Tierney are accused of plotting to rob Community Bank on North Comrie Avenue last fall, prosecutors said. Kenna, who is currently being held at Fulton County Jail and has also been listed as from Johnstown, was initially arrested on weapons charges in November after he was allegedly found with a…