OK so I know that this is a very long article about mental illness issues, but it was the definitions at the start of the discussion which reminded me of the WT organisation. See if you agree.
Paranoia:
1. Mental illness characterized by systematized delusions of persecution or grandeur usually without hallucinations
2. A tendency on the part of an individual or group toward excessive or irrational suspiciousness and distrustfulness of others
Delusion:
1. Something that is falsely or delusively believed or propagated.
https://drmelissawelby.com/3-types-of-paranoia-what-does-paranoia-mean/