After the murders of numerous Osage Indians, why did they think it was necessary to get federal investigators involved?
They were the only ones who took the murders seriously.
The police force in Pawhuska refused to investigate the murders.
They had no choice. The sheriff told them the FBI had to be involved.
They were beginning to suspect that the authorities in Osage county were involved in some way.

The need for federal investigators in the Osage Indian Murders arose due to police refusal, suspicions of local involvement, and lack of seriousness in investigations.

Explanation:

During the Osage Indian Murders, the murders of numerous Osage Indians prompted the need for federal investigators to get involved for several reasons. Firstly, the local police force in Pawhuska refused to investigate the murders, leaving the cases unsolved. Secondly, the Osage people began to suspect that the authorities in Osage County might have been involved in the murders in some capacity. Lastly, the lack of seriousness from local law enforcement towards these crimes led to the necessity of federal intervention in order to ensure justice for the victims.

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