Is it illegal for someone to engage in property privately in the community and fence at the door? Which department should I complain to?

There are two situations. One is that residential property is self-sustaining. They have the right to do some moderate publicity in residential areas. If it really affects residents' rest, you can raise relevant objections to the property manager. The other is the management of the street office. If the property has done these things, it can complain to the sub-district office of the community, which is quasi-effective. I wish you a happy life, thank you.