In a further development in the row, a Welsh Labour spokesman had this to say .
Hearing Leanne Wood and Plaid Cymru banging on about tribalism once again is as pathetic as it is predictable, coming as it does from a party whose guiding principle is the indisputably tribalist politics of separation.
Welsh Labour remains as proud as ever of its long and deep rooted bond with its affiliated Trade Unions and we were disgusted by Leanne Wood's inaccurate and vindictive attack on the good work that they do.
But people in Wales will see her claims for what they are-the grubby politics of a leader who has already lost her way and the support of much of her party.
– Welsh Labour Spokesperson
The spokesperson went on to say
There are many reasons why Trade Unions remain deeply suspicious of Plaid Cymru.
Plaid's threat of separation, threat to the UK economy, threatening to tear up pay bargaining arrangements, telling lies about the Welsh Union Learning Fund and calling development grants for working people "bribery" are just some of them.
Andy Richards , leader of Unite ,had described Plaid's call for a coalition of left wing groups to challenge austerity measures " a publicity stunt "
But Plaid Cymru AM Rhodri Glyn Thomas hit back accusing Mr Richards of putting his own political interests above those of his members.
This is an astonishing outburst from Andy Richards who seems unable to accept that Plaid Cymru has shown long term determination to stand up for the rights of working people.His tribal comments show clearly that his priority is what's best for the labour party rather than what is best for his members.
Over the past months, I and many Plaid Cymru colleagues have stood shoulder to shoulder with members of trade unions, including Unite, who have been fighting for a fair deal on pensions and to save jobs that the UK Government want to axe.
– Rhodri Glyn Thomas AM Carmarthen East and Dinefwr
The Am went on further to say
The Labour party on the other hand has refused to support these efforts.
Labour's Ed Milliband has even said he will not reverse the cuts being made if he gets a chance.
If Mr Richards spends his time fighting for what's best for the labour party rather than what's best for Unite members, maybe he should consider if he is in the right job.
If Labour in Wales is really interested in what's best for workers, they will disassociate themselves from Mr Richard's comments.
I invite Carwyn Jones to make a swift and clear statement opposing these tribal and sectarian remarks
– Rhodri Glyn Thomas AM, Carmerthen East and Dinefwr
Andy Richards, Secretary of Unite, Wales, is claiming Plaid Cymru leader Leanne Wood's call to form a coalition of left wing groups as "an opportunistic publicity stunt."
The timing of Plaid Cymru's announcement is as cynical as it is shameless . This is nothing more than an opportunistic publicity stunt ahead of next week's TUC conference in Llandudno and on the back of a second electoral rejection in a row of Plaid Cymru by Welsh people in the local elections.
Unite Wales is already committed to working with fellow trade unionists and other community organisations in Wales to fight the UK Governments austerity agenda and further action against the cuts is high on the agenda at next week's conference.
– Andy Richards, Secretary of Unite, Wales
Mr Richards went on to explain:
We want to go one step further for the people of Wales and next week will open our discussion on "Making Devolution Work" , a positive progressive policy debate on how we work within a devolved Wales to win for workers and the Welsh Economy as a whole.
The term 'Plan B' has become political shorthand for the notion that the UK Government's cuts programme should be replaced with an alternative that focuses more on growing the economy.
Plaid Cymru leader Leanne Wood thinks there's enough of a consensus amongst groups on the left of politics that they should form their own coalition to oppose that of the UK. But many of the organisations on the left have strong links to Labour - so how successful will she be?