We need to be very careful.
Even if the information is well known that this person mis behaved when he was young , but he improved his ways. Or their is negative information about his parents , but he is not that way.
It is forbidden to reveal this type of old news even if does not add to the accurate details. Even if every one seems to know about it.
Now may be a good time for a gem of Torah study.
www.GemsofTorah.com