I don't know if this has been posted here before, seeing as the videos are 4 and 5 years old. The older one analuzes the coverup of CSA by the WTS, but also does a very good job of covering the 1975 issue:
https://www.youtube.com/watch?v=xFt_aeQw2GA
There is also a two-part series on the Australian Royal Commission's investigation into how the WTS handled CSA cases:
https://www.youtube.com/watch?v=TsvJMlg_SaM
and