The anti-monarchy group tweeted: “If they’re going to start complaining then they also need to start explaining.
“They can’t moan about ‘unfounded claims’ and also insist on extraordinary levels of official secrecy.”
The first episode of the two-part The Princes And The Press programme, presented by Amol Rajan, aired on Monday.
The Royal Family have been urged to ‘start explaining’ by an anti-monarchy group
The programme explored the relationship between Prince William, Prince Harry and the press.
The documentary included suggestions of royal sources briefing journalists behind the scenes.
But the royal households lashed out at the BBC giving credibility to “overblown and unfounded claims”
Buckingham Palace, Clarence House and Kensington Palace said in a statement: “A free, responsible and open press is of vital importance to a healthy democracy.
“However, too often it is overblown and unfounded claims from unnamed sources that are presented as facts and it is disappointing when anyone, including the BBC, gives them credibility.”
She said: “I think that they’ve had enough of being attacked without speaking out.
“The Queen’s idea of don’t complain or explain has been a very strong one, but it doesn’t work in today’s modern world with so much social media.”
Ms Levin also accused the programme of being biased against the Duke of Cambridge and Prince Charles.
She said: “It’s very biased towards anti-William, anti-Charles and pro-Meghan and Harry.
“So you have to wonder how that’s come about.”
Last night’s documentary comes after tensions between the BBC and the royals erupted earlier this year over Martin Bashir’s Panorama interview with Princess Diana.
William launched a blistering attack on the corporation over the “deceitful” 1995 programme.
Source: EXPRESS CO UK