Nairobi, Kenya's capital, has several estates that have historically been associated with the presence of dangerous gangs. These gangs often engage in criminal activities such as extortion, robbery, and violence, impacting the safety and well-being of residents. Notable estates include:

1. Kayole: Located in Nairobi's Eastlands area, Kayole has been identified as a hub for criminal gangs. Notably, the Gaza gang operates here, engaging in activities like extortion and informal security services. The area has also been associated with the Mungiki sect, known for its involvement in various criminal enterprises.

2. Mathare: As one of Nairobi's largest informal settlements, Mathare has experienced significant gang activity. The Mungiki sect has a notable presence here, engaging in extortion and contributing to the area's security challenges.

3. Dandora: Historically, Dandora has been considered one of the most dangerous parts of Nairobi, with armed robberies and gang activities being commonplace. Some of the country's most notorious gangs have set up their bases in this area.

4. Lucky Summer: This estate has been overrun by criminal gangs, with reports indicating that gangsters can chase individuals in broad daylight, brandishing weapons. The area is known to be dangerous, and many criminals are believed to use it as a hideout.