reorganization

(noun) the imposition of a new organization; organizing differently (often involving extensive and drastic changes). Synonyms: reorganisation, shake-up, shakeup. Examples: "A committee was appointed to oversee the reorganization of the curriculum." "Top officials were forced out in the cabinet shakeup."

(noun) an extensive alteration of the structure of a corporation or government. Examples: "After the takeover there was a thorough reorganization." "The reorganization was prescribed by federal bankruptcy laws."