A Liberal Party activist working on the party's campaign in key marginal seats is a former neo-Nazi who claimed in 2010 that the Port Arthur massacre was a Jewish conspiracy.

Scott Harrison has been vice-president of the Deakin University Liberal Club, and has been working on the campaign of Liberal candidate Tony McManus in Lara. He has also briefly assisted the party's Bellarine candidate, Ron Nelson.

Mr Harrison is a former prominent member of the white supremacist group Church of Creativity. The church was founded in the United States in 1973 by neo-Nazis and has several members in Australia, including criminals.

When contacted by Fairfax Media, Mr Harrison acknowledged his six-year involvement in the neo-Nazi movement but said it had ceased in 2010 and that he now repudiated his former beliefs.

"My close associates in the Liberal Party know of that history," he said, while also stating that others in the Liberals "wouldn't be aware of it to a high degree."