In those days in that very prohibitive racial climate, One did not become America’s Top lawman with any ethnicity other than Caucasian. And the descendants of those same murdered family members will not talk about it today out of fear, long after Hoover himself died in 1973.
Hoover would never, ever hire a black man because of his prejudice and in spite of his keeping his family background a secret. any smart FBI agent who cottoned onto the fact that Hoover was part black because his features, although not immediately recognizable as black were recognizable to those with a trained eye. Anybody applying to the FBI was stringently background-checked to make sure there was no black blood in him. Any agents who voiced suspicions about Hoover being part black was immediately fired. Hoover did not wanted his secret known to anyone.