Tony Woodley, joint leader of Unite, condemned what he said were Government attacks on union members.
"I don't blame our PM for trying to help bring together parties to resolve the dispute," Mr Woodley said in an interview with BBC Radio 4's World at One.
"But it is rather unfortunate that the government of all shapes and sizes always want to kick the unions and kick the employees when in actual fact it's my members who've been kicked here."
Mr Woodley was particularly critical of Lord Adonis, saying: "For an unelected person who hasn't got a clue about this dispute, it would have been wiser for him to have kept his counsel.
"He's got no industrial experience whatsoever."
The Unite union has announced two sets of strikes
Mr Woodley and Derek Simpson, his co-leader of Unite, said that for any talks to be re-started, BA chief executive Willie Walsh would need to put the settlement offer back on the negotiating table.
BA withdrew its offer on Friday after the airline said it was conditional on strike action being averted.
That offer had included commitments on working hours and annual pay rises in exchange for the cabin crew workers agreeing to the BA's planned £62.5m of cost cuts.
Shadow chancellor George Osborne said Mr Brown could not have it both ways - condemning the strike while at the same time taking money from Unite.
"In the end this is a question of leadership for Gordon Brown," Mr Osborne said. "He has to cut off links with the Unite union, which is in effect a party within a party.
"Condemning the strike is one thing. But is he going to go on accepting the strikers' money?" Mr Osborne said.
Meanwhile, BA has published on its website some flight information for the proposed strike dates.
However, the website statement said the details are not complete. "We are currently finalising our flight schedules for the strike period and have temporarily stopped selling seats on all flights operating on the strike dates," BA said.
"We will finalise these schedules in the next few days and further information will be posted here as soon as it is available."
Details of the cancellations would allow hundreds of thousands of passengers to make informed choices about what alternative arrangements to make.
But BA is emphasising that it intends to operate the majority of its flights, about 70% overall. Most cancellations are likely to be domestic and short haul flights.
BA also hopes to be operating at least 23 aircraft with replacement crews made up of other staff.
Will you be affected by the strikes? Send us your comments using the form below:
A selection of your comments may be published, displaying your name and location unless you state otherwise in the box below.
The BBC may edit your comments and not all emails will be published. Your comments may be published on any BBC media worldwide.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.