Yesterday's session opened with the publication of a reopened investigation into Chelsea player Eni Aluko's claims of bullying and discrimination against the former England women's manager.
Unlike a flawed internal FA review and an earlier inquiry by barrister Katharine Newton, the third attempt at uncovering the truth found that Sampson had made racist remarks to Aluko in 2014 and team-mate Drew Spence in 2015.
FA chairman Greg Clarke, chief executive Martin Glenn, technical director Dan Ashworth and human resources director Rachel Brace were interrogated by the lawmakers on the digital, culture, media and sport committee for two hours.
Black former Arsenal and England forward Ian Wright tweeted on Thursday: "Rome is burning @FA! You know where I am. If you're not part of the solution, you're part of the problem! I don't want to feel like that."
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Former England striker Gary Lineker tweeted: "Damning and damaging for FA with total vindication of @EniAlu."
- 'Blackmail' -
The chief executive denied trying to "blackmail" Aluko into making a statement that the governing body is not institutionally racist.
The 30-year-old striker had earlier told the panel she has not received a "second tranche" of the Pound 80,000 settlement she agreed with the FA earlier this year to avoid going to an employment tribunal following her allegations against Sampson.
Aluko, who has 102 caps for England, said she was told by Glenn that she would get the rest of her money, which was to compensate her for loss of future earnings, if she wrote a statement clearing the FA of racism.
Glenn refuted Aluko's claim, saying the FA had stopped the second payment, due after this summer's European Championship, because of a tweet Aluko sent on August 30.
That Twitter message said: "At least we now know the FA's stance on derogatory racial remarks by an England manager. Ignore, deny, endorse. In that order."
Glenn said the FA took legal advice and decided it breached their agreement "not to defame each other".
"I think it was disappointing that not even until right at the end was Greg Clarke prepared to admit the FA should apologise for failings in its process -- quite serious failings in a process the individuals on that panel were responsible for."
He added: "The question should be: does what you've seen today inspire confidence and do they understand the issues well enough to put in place the right systems to ensure it doesn't happen again? And I'm not convinced."
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