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By Daniel Davies
BBC Wales political correspondent
Plaid Cymru needs to "detoxify a culture of harassment, bullying and misogyny", according to a damning review of the party.
It says "too many instances of bad behaviour" by politicians have been tolerated within the party.
Plaid leader Adam Price told BBC Wales he would not resign, but wanted to "lean in" to help fix the problem.
He admitted the highly critical report had "harmed and tarnished" the party.
Mr Price apologized to all those who experienced or witnessed unacceptable behaviour and said Plaid Cymru was a product of the society it was trying to change.
A working group started looking at complaints about the party's internal culture last December.
It was led by former Plaid politician Nerys Evans.
The key findings of its Prosiect Pawb (Everyone's Project) report say "inaction over many years, from those with positions of power to challenge bad behaviour has made a bad situation even worse".
Evidence from an anonymous survey of staff and elected members "highlight cases of sexual harassment, bullying and discrimination - these are not isolated cases".
Most discrimination was gender based, it says.
The report says Plaid Cymru's governing national executive council "must be confident actions taken in the light of Prosiect Pawb's findings and recommendations will be effective in enabling permanent, non-reversible measures to detoxify a culture of harassment, bullying and misogyny and to make Plaid truly and visibly welcoming to women".
HR issues need to be addressed "urgently", it says, adding: "Staff have reported bullying and discrimination in the workplace. We need to better understand the extent and scale of these issues.
"Many staff do not feel that there are safe systems to raise concerns, seek support or challenge what they see.
"They've seen too many instances of bad behaviour by elected members be tolerated and feel that there is little point in raising concerns."
It goes on to say that "a lack of collective leadership and governance across the party which has meant that these issues have worsened over the last few years".
How has Adam Price responded?
Asked if he would resign, Mr Price said: "The assessment I've come to my responsibility now is to lean into this work and work with others across the party to get this right.
"By walking away, I wouldn't be contributing to that. I would be abdicating my responsibility."
He said he wanted "to apologise to all those who have either experienced or witnessed unacceptable behaviour within the party".
Mr Price admitted the party had a "culture which has allowed behaviour to go unchallenged when it should have been".
Mr Price said the report was "very painful and sobering to read" but "even more painful for those who had to experience it".
He said the report's findings "would certainly have harmed and tarnished the reputation of the party, and the trust and the credibility of the party".
But he said Plaid Cymru is a "product of the society that it is trying to change".
"We are transitioning as a society. Things that were deemed acceptable, [which] should never have been acceptable actually in the past.
"We are realising like never before we should not accept that behaviour."