The enemy within

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Across
  1. 4. the act of a deliberate violation of trust, confidence, or allegiance, often involving deception, perfidy, or betrayal
  2. 7. to implant a substance, such as a virus, microorganism, or vaccine, into a recipient to induce a specific immune response, stimulate growth, or produce immunity against a disease
  3. 8. to undermine, overturn, or overthrow something established, such as a government, an institution, or a way of thinking, leading to its downfall, corruption, or destruction
  4. 9. to undo something complicated by separating its parts
Down
  1. 1. to use it up or reduce it greatly in amount, quantity, or strength, often to the point of being nearly empty
  2. 2. something harmful that progresses in a stealthy, gradual, and often unnoticed way, leading to a significant, negative effect over time
  3. 3. to give support to, strengthen, or reinforce something, whether it's a person's confidence or a physical structure
  4. 5. describes something spreading or increasing in an uncontrolled, unchecked, or wild way
  5. 6. the highest form of animal social cooperative organization