Current members of Labour party staff have passed a motion at a meeting of one of the party's recognised trade unions, condemning their employer's response to the recent Panorama programme and demanding an apology to whistle-blowers.

The motion, which passed by a huge majority of 124 to 4 at the meeting of GMB-affiliated staff members, heavily criticises the party's response to the BBC programme, which saw whistle-blowers describe the effect that working in Labour's campaigns unit had on their mental health, and young Jewish activists recount their personal experiences of anti-Semitism.

One current staff member told BuzzFeed News that employees were facing a "mental health crisis", which had been compounded by Labour's response to the programme.

The "whistleblowing and anti-Semitism" motion was submitted anonymously by two GMB members, who as current staff members were concerned about reprisals. As an employer, the Labour party recognises two trade unions, Unite and the GMB. BuzzFeed News understands GMB is the largest.

The motion singled out the party's official @LabourPress Twitter account for criticism, and states that staff noted the Labour party's response to the programme "with sadness".

It was passed to BuzzFeed News in advance of the meeting, on the same day that more than 200 current and former staff members and supporters wrote to Labour leader Jeremy Corbyn, criticising the party's response to the documentary.