Parsons become the first female to serve on Cardiff’s board when she was appointed a non-executive director in 2019.
In the email to Evans, she describes herself as a “business professional and entrepreneur, who founded a multimillion-pound business that remains in Wales”.
The founder of the price comparison website GoCompare, she sold her stake in the company for almost £44m.
Her correspondence urges Evans to “take immediate and decisive action to address the issues raised in the programme, but also against a backdrop of a long-standing and deep-rooted culture of toxicity and bullying within the WRU”.
“In my role at Cardiff Rugby, I constantly witness and have to deal with the fallout of incompetence at the Welsh Rugby Union,” wrote Parsons.
“I believe the board, in its current state, does not possess the expertise and experience to run the WRU, which is essentially a £100m company.
“As a group of individuals, they are not fit for purpose, and the future of Welsh rugby requires people with the capability and experience to turn this urgent and dire situation around.
“Many people have told me first-hand about the culture of bullying and manipulation within the WRU.”
In his response, WRU chair Evans added: “We must re-examine, re-evaluate, act decisively where we find wrongdoing, and move forwards.
“We will do this together, we take responsibility together. We will also seek outside influence and counsel as well as looking within to the likes of our independent board directors as Hayley suggests.
“I am already on public record, in a letter I wrote to member clubs for the new year, with my ambitions to evolve the governance structure of the WRU with the clubs and we will address this challenge with renewed vigour immediately.
“We will use the pressure we are under now, the pressure we have drawn on ourselves, to get better, to improve. I will not waver from this task.”