The wannabe Nazis who planned to shoot up a synagogue in New York City plotted with two other people, including a state prison inmate whom they told about their plans to get a gun, prosecutors revealed Wednesday. The new detail emerged as Christopher Brown and Matthew Mahrer, both 22, were indicted in Manhattan Supreme Court. Advertisement Matthew Mahrer and Christopher Brown (Obtained by Daily News ) Brown, a confessed white supremacist, posted a series of disturbing tweets promising “big moves” and saying that he might “shoot up a synagogue and die,” according to prosecutors. Mahrer, who’s Jewish and the grandson...