If your neighbor was a gang?

Japan is an island and its land is mostly covered with mountains. So there is not enough space for housing. Thus, prices of lands tend to be high and houses/buildings stand densely.
One day, a man, his nickname is Suica(water melon), draws lots of attention by his tweets about annoying neighbors. Suica said he has been in trouble with his neighbor. The neighbor seems to be a gang and makes noise every day even at night. For self protection, Suica set a monitor camera outdoor and uploaded the photos of gang's nuisance.

うわぁ、隣人が帰って来てなにやら広げ始めた。さらに仲間達と洗車まで。 #道路族 #隣人トラブル この中を出入りする気持ち想像つきますか？ pic.twitter.com/bsmuJ6h3GY

— すいか (@6Zj5Bf3cf7HNcG2) 2018年8月19日

He said, "Oh,he came back and seems to start something. In addition, he started washing a car with friends. Can you understand my feelings when I walk along the scene?"

He has consulted police since 2012 but nothing is solved.

As explained, buildings here are close to each other, and mansions/flats have thin walls. So there often happens noise problem between neighbors. Some injure their neighbors and others even kill neighbors.