Victims and survivors of violent sex crimes at the hands of repeat dangerous sex offenders, will march in the city on Saturday.

Opposition Leader Mark McGowan, Derryn Hinch, Margaret Dodd and other ambassadors will join the rally from Forrest Place at 11am, to call for mandatory sentencing and no parole for repeat dangerous sex offenders.

Angela Johnston, a victim of paroled DSO Warren Ugle, who faces court tomorrow on charges of breaching that parole, joined Gary Adshead on the 6PR Morning Program.