Answer: Espionage and Sabotage
Step-by-step explanation:
Espionage refers to the action of countries or companies to spy on the activities of others with the intention of acquiring information that is not supposed to be disclosed to them. It is illegal and can land one in a lot of trouble.
Sabotage is another word with a negative connotation. It means the act of damaging assets and resources to ensure that they cannot be used for the purpose they were meant for. In the above excerpt, Sabotaging National Defense systems can lead to a country being defenseless against aggression which is what President Roosevelt was alluding to.