Conspiracy theories

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Across
  1. 2. to keep a secret, to lie ....
  2. 6. fit in, mix, merge, blend in
  3. 8. a concept, a thought
  4. 11. the killing of 6 million jews across Europe from 1941 to 1945
  5. 13. the I in CIA
  6. 16. first man to walk on the moon, Neil ........
  7. 18. shady, dim, sunless
  8. 19. another name for covid-19
  9. 20. keep an eye on, surveil, tail
  10. 21. princess ........ she was killed in a car crash in Paris in 1997
Down
  1. 1. secret, confidential
  2. 3. some people believe that the earth is .......
  3. 4. a US president who was assassinated
  4. 5. the f in FBI
  5. 7. secret organization, secret club or secret .........
  6. 9. falsify, fabricate, bluff
  7. 10. when someone is very happy, we say he is over the ......
  8. 12. doubt, uncertainty
  9. 14. a digital attack, a ....... attack
  10. 15. ........ 51
  11. 17. extraterrestrial, unearthly