Sentence:  The action of the Commission in allowing or denying any claim under this title shall be final and conclusive on all questions of law and fact and not subject to review by the Secretary of State or any other official , department , agency , or establishment of the <WSD>United</WSD> States or by any court by mandamus or otherwise . 
Meaning of the word marked with <WSD> tags:  the executive and legislative and judicial branches of the federal government of the United States