Bar on civil suits prevents challenging tax proceedings or suing government officers for good-faith acts under tax law. No suit shall be brought in any civil court to set aside or modify any proceeding taken or order made under the Act; and no prosecution, suit or other proceeding shall lie against the Government or any officer of the Government for anything in good faith done or intended to be done under the Act. This bars civil challenges to tax orders and protects the Government and its officers from proceedings for acts done in good faith under the Act.