Former MP Shelley Archer and her high-profile husband Kevin Reynolds have been formally rejected by the WA Labor Party.
The party's State executive decided on Monday not to accept the couple's application to rejoin Labor, which could also end Ms Archer's hopes of making a political comeback.
Joe McDonald, one of Mr Reynolds' loyal lieutenants from his days running the Construction, Forestry, Mining and Energy Union, was also blackballed by the party's chiefs.
But Ms Archer signalled the trio's fight to re-enter the party they quit in 2007 was not over.
"It's what I expected," Ms Archer said. "We can appeal to a committee in the WA branch within 21 days and we'll be looking at that and other avenues."
The catalyst for the falling-out was then-premier Alan Carpenter's move to have Ms Archer dumped from the party because of her connections to former premier and lobbyist Brian Burke.
She believes it is all about the party's Left, which she claims is guided by former Labor powerbroker Jim McGinty.
"This is just Jim McGinty and his goons," Ms Archer said. "The Left are running scared about the fact that the CFMEU has rejoined."
Mr McGinty said the claims were a nonsense.
"I didn't even know that the Labor Party had rejected their application for membership," he said.
"I retired four years ago and play no ongoing active role in these matters."
Labor's State secretary Simon Mead declined to comment.