Since its beginnings the FDA has always genuflected to business. Many people in the department worked hard to document toxins that the American public were being exposed to (e.g. arsenic and coal tar used as food coloring, formaldehyde and borax used to preserve milk and meat). However the department's leadership, and in a few cases the U.S. President, intervened to protect business interests. If you're interested check out The Poison Squad[1].

[1] https://www.penguinrandomhouse.com/books/312067/the-poison-s...