Answer :
Vivien Thomas was shunned at John Hopkins because of the racial prejudices at the work place.
Vivien Thomas
He is known for developing procedure to treat blue baby syndrome, despite of the fact that he did not have any professional education or experience in research laboratory.
He served 35 years as supervisor of surgical laboratory of John Hopkins Research Laboratory. During his life time he was subjected to discriminations, which he called "racial prejudices".
The Racial prejudices in 1940s were related to boycott of black color doctors by white people, since Vivien Thomas was a Black Color doctor and that too an experienced surgeon of Heart.
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