Scammers. And enough.

In the field I work in, there are countless scammers.
And what will we do?
There is a WhatsApp group of those involved in the field, and every now and then someone who has been stung posts that someone else was stung, so that anyone who wants to be careful and save money knows who to beware of.
Although it is not without problems.
A. Many do not advertise.
on. It is difficult to track in each case whether there was indeed a sting here or whether side 1 actually sees it that way, but if we delve into the depths of a conflict we will understand that there is also a second side to the coin, of course it is difficult to do so every time.
 
My questions:
A. Am I allowed to keep the name of the fraudster on duty in my names under the “Cruelty Caution” mark?
(There are apps today that show everyone how a person is known to others, and so his close friends, family, and anyone who wants to do business with him sees that there are so-and-so people who are calling him a fraud, of course he cannot find out in any case)
 
on. Am I allowed or perhaps even required to forward to other WhatsApp groups in the field to beware of the scammer on duty?
And again he is unable to investigate every case…
 
What to do?