215 ILCS 5/155.06
The board of directors of any domestic insurance company may adopt emergency by-laws to be approved by the Director, which will become operative during an emergency resulting from an attack upon the United States by nuclear, chemical, bacteriological or biological weapons. The emergency by-laws may include provisions relating to a line of succession of the officers, the manner in which vacancies on the board of directors shall be filled, how and when the emergency board of directors may transact business, alternate locations for the principal and regional offices, emergency maintenance of books and records, and any other measures reasonably related to the interim management of company affairs. If emergency by-laws are adopted, copies shall be sent to the shareholders, or similar body in other than stock companies, who may repeal or modify them at the annual meeting or at any special meeting called for that purpose.
215 ILCS 5/155.06