| Ex. ECO-A-124 | Advisory Memorandum on Ensuring Essential Critical Infrastructure Workers' Ability to Work During the COVID-19 Response, Version 4.0 (Aug. 18, 2020) (the document also carries the Dec. 16, 2020 Version 4.0 reissue date)CISA Essential Critical Infrastructure Workforce guidance, Version 4.0 | CISA, Department of Homeland Security | United StatesFederal | Aug. 18, 2020 | 2020 Q32020 Q42021 Q12021 Q22021 Q3 | Business closure | Primary source read | |
| Ex. SEC-18-001 | Guidance on the Essential Critical Infrastructure Workforce, Version 4.1Advisory Memorandum on Ensuring Essential Critical Infrastructure Workers' Ability to Work During the COVID-19 Response | Cybersecurity and Infrastructure Security Agency (CISA), Department of Homeland Security (Director Jen Easterly) | United StatesFederal | Aug. 10, 2021 | 2021 Q3 | Other | Primary source read | |
| Ex. SEC-07-024 | Guidance on the Essential Critical Infrastructure Workforce, Version 4.1Advisory Memorandum on Ensuring Essential Critical Infrastructure Workers' Ability to Work During the COVID-19 Response, Version 4.1 | CISA | United StatesFederal | Aug. 5, 2021 | 2020 Q42021 Q12021 Q22021 Q3 | Other | Primary source read | |
| Ex. AGY-DEFENSE-GUARD-037 | Memorandum for Defense Industrial Base, Defense Industrial Base Essential Critical Infrastructure Workforce (Mar. 20, 2020)Defense Industrial Base Essential Critical Infrastructure Workforce | Under Secretary of Defense for Acquisition and Sustainment Ellen M. Lord | Defense Industrial Base (all DoD prime contractors and subcontractors)Federal | Mar. 20, 2020 | 2020 Q22020 Q32020 Q42021 Q12021 Q22021 Q3 | Business closureWorkplace rulesSupply chain | Primary source read | |
| Ex. AGY-FED-FINANCIAL-012 | SR 20-6Identification of Essential Critical Infrastructure Workers in the Financial Services Sector During the COVID-19 Response | Board of Governors of the Federal Reserve System | United States; Board of Governors of the Federal Reserve System (federal)Federal | Mar. 27, 2020 | 2020 Q22020 Q32020 Q42021 Q12021 Q22021 Q3 | Stay-at-homeTravel and quarantineOther | Primary source read | |
| Ex. SEC-13-001 | Statement by Secretary Steven T. Mnuchin on Essential Financial Services Workers (press release SM956), transmitting the memorandum Financial Services Sector Essential Critical Infrastructure WorkersStatement by Secretary Steven T. Mnuchin on Essential Financial Services Workers | Secretary of the Treasury Steven T. Mnuchin | United StatesFederal | Mar. 24, 2020 | 2020 Q22020 Q32020 Q42021 Q12021 Q22021 Q3 | Business closureOther | Primary source read | |