A 21-count superseding indictment unsealed Wednesday charges 12 individuals with conspiring to violate federal firearms statutes, including engaging in the business of dealing in firearms without a license; transporting and receiving firearms into another state; making false statements to a federally licensed firearm dealer; conspiring to possess firearms in furtherance of drug trafficking crimes and to use and carry firearms in relation to crimes of violence; and conspiring to commit money laundering, as well as other related substantive offenses.