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In the case of the Challenger accident, the actual orbiter wasn't the problem. The seals on the solid rocket boosters were. That said, I don't know who was responsible for their design/manufacture.

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Thiokol[1], who were later bought out by ATK who in turn were bought out by Northrop Grumman.

[1]: https://en.wikipedia.org/wiki/Thiokol

Thiokol + Hercules = ATK

ATK + OribtalSciences = Orbital ATK

then NG bought out Orbital ATK

The teams responsible for their design and manufacture were sounding the alarm about the o-rings being out of their operational envelope. It was management at the manufacturer and NASA that decided to proceed.

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