A high-stakes dispute over whether an indictment will stand against former FBI Director James Comey is putting attention on grand juries and how they work in secret to bring charges in U.S. federal courts. The U.S. Justice Department admitted there may have been a problem in how Comey’s case was presented to a grand jury in Alexandria, Virginia. Comey wants the case thrown out on grounds that the government was being vindictive, among other objections. Comey is charged with making a false