"It's no secret that JOY 94.9 has seen an exodus of extraordinary on-air presenters and volunteers who have been forced out or who felt the need to walk away under the current management and board," the letter reads. "Nor is it a secret that morale at JOY 94.9 is possibly at its lowest point ever.
"Enough of the bullying. Enough of the lack of action by the board. Enough of breaking the rules of JOY's constitution."
In a email to JOY members, the board said the allegations of bullying had been investigated and could not be substantiated.
"It appears that the groups objective is to run a vicious and calculated campaign to undermine your Board, our volunteers, staff, and supporters, and to maximise damage to JOY," the email says.
The email said the station's members contact database had been "stolen" and the matter would be reported to Victoria Police.
Tensions are expected to come to a head in coming weeks, should the disgruntled members receive the 100 required signatures to call a special general meeting.
The network's CEO Tennille Moisel said the Board and management team at JOY were aware of the circulated letter, and had been "working with a subset of the members named in this letter to understand and investigate their concerns".
"The Board has already responded to the allegations and has been doing everything possible to be constructive and resolve the situation," she said in a statement to The Age.
"The Board and management team are conscious that there will always be parts of the membership base that do not agree with how the station is run, and we believe that this is the motivation for these allegations and the call for a Special General Meeting.
"The Boards focus has at all times been to do what is best for JOY – for our members, our volunteers, our staff, our sponsors, our supporters and our listeners.
"As a membership organisation, our Rules of Association provides mechanisms for members to raise concerns, and the JOY Board respects this. At this stage, there are no grounds to convene an SGM, but we will continue to respond to any reasonable requests by our members appropriately and fairly."
Current and former JOY FM volunteers have been reluctant to speak on the record. However, they say the allegations contained in the letter extend to more than just one person on the station's leadership team.
"A lot of people are really unhappy," a former JOY broadcaster said.
A former JOY employee said the workplace culture has turned toxic, with some volunteers barred from being on-air and locked out of the building.
"There's dozens of people who feel really victimised and bullied," he said. "These are people who have been within the organisation for the last 12, 15 years. These are good people.
"It's absolutely appalling and people have left in droves. This is a place where people are meant to feel safe and secure."
JOY 94.9 made its on-air debut on World AIDS Day in 1993. Based in Melbourne, the station holds annual fundraisers and has been a fixture of the city's community radio scene since being granted a full-time broadcasting licence in 2001.
It has helped launch numerous media careers, including that of Sky News Melbourne bureau chief Ahron Young.
The station has strict security measures. Staff and volunteers were forced to evacuate after receiving a bomb threat in 2016 amid the debate about whether or not Australia should hold a plebiscite on same-sex marriage.
Broede Carmody is an entertainment reporter at Fairfax Media.
Morning & Afternoon Newsletter