A Labor senate candidate who raised allegations of blackmail and called for a "#MeToo moment" in the Australian labour movement has been banned from attending her union's national conference on the Gold Coast next week.

The Australian Federal Police are assessing allegations Alana Herbert, who is the vice-president of the Australian Workers Union in WA and an organiser for the union, was threatened with the release of intimate images if she did not withdraw from a union election.

Labor senate candidate Alana Herbert has been banned from the AWU national conference for her safety. Credit:WA Labor/Facebook

In a separate incident, AWU staff were asked in November by then WA secretary Mike Zoetbrood to explain "inappropriate and highly offensive" group text messages, in which Ms Herbert was allegedly described as "sloppy seconds" and likened to a GIF of a semi-naked woman.

An AWU official told Ms Herbert last week he was "compelled to cancel your attendance at the national conference" in a letter written before the allegations were made public.