Wether intended or coincidental (e.g. you go to the Pub wearing the colours of a Union or Football Club and by co-incidence, 2 others are in the same premise of the same affiliation. The definition of a gang is 3+ persons wearing 'affiliated colours'.
1) https://www.abc.net.au/news/2016-11-30/queensland-reworks-an...
2) https://www.news.com.au/national/courts-law/secret-report-re...
3) http://www.proctorlaw.com.au/law-blog/criminal-law/vlad-laws...