Jimmy Savile and Stuart Hall used their fame and position as BBC celebrities to abuse the vulnerable, Dame Janet Smith has said.
Dame Janet, who led the investigation into Savile's abuse, described him as "opportunistic and shameless".
"They must be condemned for their monstrous behaviour," she said following the publication of her report.
Dame Janet said she identified five occasions when the BBC "missed an opportunity to uncover their misconduct", saying the culture of the BBC allowed their behaviour to go "undetected for decades".
However, she denied the BBC had sought to influence the review, saying a delay following its completion in April 2015 was due to concerns raised by the Metropolitan Police that it might affect ongoing investigations.
A former Jim'll Fix It producer said he thought Savile's presence was "unnerving" to children.
Katrina Rose was just 14 when she was abused by Jimmy Savile but told ITV News she fears a similar scandal could happen again now.
Jimmy Savile's abuse could have been stopped if people had listened to "the small voice standing up against authority", Lord Hall has said.