Which case highlighted the failure of authorities to investigate despite knowledge of ongoing abuse?

The case that highlighted the failure of authorities to investigate despite knowledge of ongoing abuse is indeed Victoria Climbie. This tragic case involved the death of Victoria, a young girl who suffered severe abuse and neglect over several months before her death in 2000. Prior to her death, multiple agencies, including social services and the police, received numerous reports concerning her welfare and the conditions in which she was living. They were aware of her situation but failed to take adequate action to protect her.

The subsequent inquiry revealed systemic failures in the social services and law enforcement agencies, emphasizing the need for better communication, accountability, and procedures to effectively address child abuse allegations. This case ultimately led to significant reforms in child protection policies in the UK, aiming to ensure that similar failures would not occur in the future.

The other cases, while also highlighting issues of abuse and failings in authority, do not specifically center on the theme of ongoing abuse being known but not acted upon to the same extent as seen in the Climbie case.