Gossip or Permissible in Case of Benefit?

Hello, We have neighbors next door who play music at a very high volume at inconvenient times, such as when putting the children to sleep, etc. These are times when music is legally allowed, but it bothers us a lot. Several times we knocked on their door to ask them to lower the volume. Once, I knocked alone, I am a married woman, and the homeowner, who is a father of children and observes the Torah and commandments, opened the door. I should note that we live in Bnei Brak. Before I could speak, he started approaching me threateningly and shouting: "Get out of here" and spoke in a very disrespectful manner. He even came close to almost touching, and I was really afraid he was going to hit me out of anger. With God's help, my husband was home, and I immediately shouted for him to come to my aid, and he indeed put the neighbor in his place. I should note that every time I remember this, tears come to my eyes, and it caused me significant trauma. I filed a complaint with the police against the neighbor for violence, which, of course, has not been acted upon yet... After the incident, my husband spoke with other neighbors in the building, and one of them, let's call him M., told him that he also encountered such an outburst of anger from the neighbor on another neighbor who approached him to comment on the dirt his children left in the building. M. said he had to intervene to help her because the neighbor was behaving violently. The question is: Is it permissible for me to write notes in the building so that everyone knows to be cautious of this neighbor? Especially the female neighbors, because he is strong against the weak... If the neighbor who was harmed before had told about it earlier, I probably wouldn't have knocked alone at those neighbors and thus avoided the trauma and moments of fear I experienced. To prevent the next incident, is it permissible for me to spread his name and warn all the building's residents?

Hello 

It is permissible to warn those who are affected by it, but it is forbidden to publish it publicly, as it reaches people who are not involved. 

And provided that you are not speaking about him to take revenge for what he did to you.