members of the senior staff may have considered the new employees threats to their security: however, they had the full support of management.밑줄 친 they가 틀렸다는 건데요...
포인트를 모르겠습니다. ㅠ
콜론 이후에 나온 문장도 해석이 어떻게 연결되는지도요..