Tranby was involved in the Black Deaths in Custody protest march. Throughout the 1980s, following the death of Eddie Murray, John Pat and so many others, the Aboriginal community fought for change, which led to the 1988 Royal Commission into Aboriginal Deaths in Custody (RCIADC). During this time, Tranby was heavily involved in the protests. After the RCIADC concluded and produced its recommendations, Tranby’s involvement continued, with the Aboriginal Development Unit conducting workshops in regional NSW to inform Aboriginal communities. In response to the recommendations, Tranby developed a course to provide vital legal knowledge for Aboriginal people, empowering them and strengthening their engagement with the criminal justice system. Tranby continues to offer this course, and today it has evolved into the 10861NAT Diploma of Aboriginal and Torres Strait Islander Legal Advocacy.