Roger Wilson was a member of the Communist Party of Australia in 1982.   He stood for the Victorian state seat of Melbourne in 1979 and as you see in this flyer again in 1982.   Note the Communist Party of Australia authorisation, B. Taft.

Here's the election result

Here's the first minutes of the first meeting of the Socialist Forum in 1984.

Max Ogden, Bernie Taft, Roger Wilson and Julia Gillard were foundation members of the Socialist Forum.

Here's another snapshot of activity a few years later - this is November 1986 and the handwriting is Julia Gillard's as the Socialist Forum prepares for a summer schoo to take place in 1987.

Note Ramona Koval, Tricia Caswell, Roger Wilson, Brian Howe, Moss Cass et al.

And here is a link to Ms Gillard speaking with Tony Jones of the ABC's Lateline program in 2007, just 9 years after she entered parliament and 6 years after Socialist Forum was de-registered.

TONY JONES: Are you now or have you ever been a member of the Communist Party? 

JULIA GILLARD: (Laughs) Tony, I think that question shows how silly all of this is getting, though I suspect in this interview, probably the Howard Government would think you're the dangerous radical. After all, I'm only from the Labor Party, you're from the ABC. 

TONY JONES: Well look, seriously, Peter Costello has thrown this out. Let's deal with it properly. What's the Socialist Forum? Were you an organiser for it? And when did that happen, if you were? 

JULIA GILLARD: Tony, it's 2007 and I'm a 46-year-old woman. What Peter Costello is referring to is more than 20 years ago when I was in my 20s. I was a full-time university student and I had a part-time job for an organisation called Socialist Forum, which was a sort of debating society. It ultimately amalgamated with the Fabian society, which of course is a long-running ideas and debating group in Australian politics and indeed in British politics before Australian politics. I've worked in the cleric and administrative work.

TONY JONES: It wasn't a front organisation for Communists?

JULIA GILLARD: Certainly not. It was an organisation where people who identified themselves as progressives, some in the Labor Party, some outside the Labor Party, would come together and would talk about ideas. I did clerical and administrative work, Tony. This is so long ago. It's the days before modern computers and the internet, in the days where if you wanted to put out a meeting notice to people you wouldn't send an email, you'd get out an envelope and put it in your IBM electric typewriter and type up the address and then get the next one. That's the sort of thing I used to do.

here's a link to the video of the interview

http://www.abc.net.au/reslib/200710/r192297_725756.asx