Howard government MP Peter Lindsay has lamented his treatment by the Queensland Liberal Nationals after quitting the party.
The Townsville-based Mr Lindsay handed in his LNP membership on Friday after being suspended over his criticisms of the 2017 election campaign in central and north Queensland.
"I have better things to do with my life and other more fruitful ways to contribute to society than by involvement in a party that treats members in the way I have been treated," he wrote on Facebook.
Mr Lindsay, who retired from politics in 2010 after 14 years as the Member for Herbert, elected as a Liberal before serving as parliamentary secretary in the Howard government, reportedly faced having his suspension extended.
"After more than 40 years of continuous service as an LNP member and holding the honour of winning more elections than any other LNP member ever (10 in a row), I have resigned my membership of the party," he said.
"The actions of a few have not affected my commitment to my values and to the platform of the party.
"I have therefore joined another state division of the party and so my decades-long membership will continue."
Mr Lindsay's suspension was part of a crackdown on public commentary, with long-term regional mayor John Wharton also suspended over his discussion about the party's campaign.
Mr Wharton, the mayor of Richmond, has also quit the party.
Signs of difficulty in Mr Lindsay's relationship with the party surfaced in 2011 when he was accused of leaking a secret internal poll that galvanised a push to dump Queensland Opposition Leader John-Paul Langbroek for Campbell Newman.
Mr Lindsay's daughter was Mr Newman's senior media adviser.