The Tasmanian Labor Party's Derwent Valley branch has unanimously passed a motion to call on former leader David O'Byrne to resign from Parliament.
The motion, passed at a branch meeting on Monday night, also expressed no confidence in the state branch's administrative committee.
An independent investigation was held earlier this year into a sexual harassment complainant made against Mr O'Byrne by a former junior union employee while he was head of the Liquor, Hospitality and Miscellaneous Union in 2007 and 2008.
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The complaint was leaked to the media without the complainant's consent and forced Mr O'Byrne to step down from the leadership and later resign.
The investigation found that Mr O'Byrne had not sexually harassed his former employee, Rachel Midson, when he sent unwanted sexually explicit text messages and twice kissed her without consent.
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The motion from the Derwent Valley branch said the investigation highlighted major deficiencies in the party's internal complaints process.
"The failure of the process tells other survivors that there is no avenue within the party to seek justice and shows perpetrators that they can be protected," it said.
"Support for the process by members of the administrative committee indicates that the committee is not serving the interest of members nor the values of the party."
Labor leader Rebecca White last month also demanded that Mr O'Byrne resign from Parliament which he refused to do.
He remains a Labor member in Parliament but sits outside the Labor caucus.
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