Harry Truman actually said...
WHEREAS in my opinion such disputes threaten to result in strikes or lockouts affecting a substantial part of the maritime industry, an industry engaged in trade, commerce, transportation, transmission or communication among the several States and with foreign nations, which strikes or lockouts, if permitted to occur, will imperil the national health and safety
Context
Executive Order 9987—Creating a Board on Inquiry to Report on Certain Labor Disputes Affecting the Maritime Industry
08/16/1948