John Solomon pointed us to this article the other day...
How FBI (or Congress) can use warrant surveilling one
American… to spy on many more
https://sharylattkisson.com/2019/12/how-fbi-or-congress-can-use-warrant-surveilling-one-american-to-spy-on-many-more/
... intelligence agencies can use one legal wiretap to
monitor as many as 25,000 people for which there was no
wiretap justification.
...
~Easy