Is it useful for the anti-gang office to find a lawyer?

Your idea is dangerous. Because individual citizens have no investigative power, and neither do lawyers. Handling anti-gang cases is a complex systematic project, and relying solely on social forces or even personal forces can only be counterproductive. Therefore, if there are clues about triad-related cases, they should be reported to relevant state organs (such as public security organs at higher levels and supervisory organs). This lawyer has been engaged in criminal investigation for 30 years. If you need to hire a lawyer to represent or defend related cases, you can contact this lawyer.