Lord Hain has defended the appointment of Sir Philip Green as a businessman in a newspaper accused of sexual and racial harassment, saying it was the "right thing"
A court order prevented the Daily Telegraph from Tycoon identified the superior used the parliamentary privilege to name him in the Lords.
A lawyer said Lord Hain's behavior was "completely inappropriate".
Sir Philip says he "categorically and completely" denies the allegations.
Meanwhile, Liberal Democratic leader Sir Vince Cable called on Sir Philip to lose his knighthood if the allegations turned out to be correct.
How did Lord Hain explain his actions?
The provisional Court of Appeals, which prohibits the appointment of Sir Philip, remains in force, but Lord Hain delivered his testimony to the House of Lords on Thursday, saying that he "held it his duty" to identify the Topshop boss, and this was in the public interest.
He said he had been contacted by someone who was "tight in the public eye." The case involved "and confidentiality agreements (NDAs)" to hide the truth about serious and repeated sexual harassment, racial abuse and bullying, "he said he should comment.
Parliamentary privilege protects MEPs or peers from making statements in to be prosecuted for the Commons or Lords one of the oldest rights enshrined in British law.
Sir Philip Green Called Harassment Claims
Lord Hain, who later spoke on BBC Newsnight, denied that he undermined a court decision and said: "I have taken it very seriously before I said it"
"I do not deny the responsibilities d he judge or timing or something similar. This is a matter for the judiciary, "he said.
" I only charge my job as a parliamentarian ̵
"And that made me act the way I did."
Lord Hain said that while his decision had been criticized on social media, he had "overwhelming support – especially from women" receive.
What was the reaction?
Labor MP Jess Phillips said Lord Hain "did the right thing, it was courageous and I doubt he made the decision easily."
But Barrister Hugh Tomlinson QC told the World Tonight of BBC Radio 4 Program The courts are the "right institutions" to decide the issues raised in this case.
Tomlinson, one of the founders of the hacked-off press campaign, said: "Parliament can not penetrate areas of the courts and say we think the courts have misunderstood – and that's what makes Lord Hain effective."  9007] Labor's former Home Secretary Alan Johnson also questioned Lord Hain's actions and told the BBC that there must be a very good reason for a parliamentarian to break the ruling of three judges who saw the evidence.
What were the allegations? in the telegraph?
The newspaper reported that interviews with five employees revealed that victims had been paid "substantial sums" in return for legal obligations not to discuss their alleged experiences.
The BBC could not confirm this the allegations in the report of the telegraph
What does Sir Philip say?
Sir Philip said in a statement on Thursday evening that he would not comment on anything that happened in court or was said in parliament.
"To the extent that it is suggested that I have committed illegal sexual or racist behavior, I categorically and completely dispute these allegations," he said.
Sir Philip said he and his company, Arcadia, "take allegations and complaints from workers are taken very seriously and in the case of a survey will be thoroughly investigated."
"Arcadia employs more than 20,000 people and receives along with many major Companies sometimes have formal complaints from employees.
"In some cases, these are done with the consent of all parties and their legal advisers, and these agreements are confidential, so I can not comment on them."
Who is Sir Philip Green?
Sir Philip Green raised a fortune from a retail empire that includes Topshop, BHS, Burton and Miss Selfridge.
His fall came after BHS, the retail chain he sold for £ 1 in March 2015, went into administration and left a £ 571 million hole in his pension fund
In 2016, a damn report was posted MPs out that Sir Philip had extracted large sums from BHS and left the business on "life support".
There were calls for Sir Philip to lose his knighthood at this time.
Later, he agreed to a £ 363 million cash compensation from the pension authority to fill the gap.
- Sir Philip Green
Why was Lord Hain's intervention unexpected?
By Clive Coleman, BBC Correspondent
People will remember the super inspection stories of recent years, including the case of footballer Ryan Giggs. When he was named with parliamentary privileges, it was frowned upon.
Parliamentarians and the judiciary were equally concerned that this privilege should not be used to undermine the rule of law.
And from that time, great efforts have been made to ensure that this has not happened again.
It is unlikely that the judiciary will be satisfied.
We have no constitutional crisis here, but we have a really significant development in the way parliamentary privilege is used in relation to court decisions.