Final answer:
Other Freedom Summer workers responded to the killing of the volunteers with resentment towards the lack of federal protection and slow investigation. The violence and threats continued, leading to distrust between black and white workers.
Step-by-step explanation:
Following the killing of the volunteers during the Freedom Summer campaign in Mississippi, other workers responded with resentment towards the lack of federal protection and the slow investigation into the murders. This led to mounting distrust between black and white workers involved in the project. Additionally, the violence and threats faced by the volunteers continued, further highlighting the challenges they faced in their efforts to register African American voters.