Australian Workers Union boss Paul Howes believes Labor and the union movement should review their relationship.
The Australian Labor Party is in the process of reviewing its structures and the reasons behind the 2013 election loss.
Transport Workers Union boss Tony Sheldon said in a speech late last year the role of unions in the party should be boosted to avoid it becoming dominated by an educated and wealthy elite like America's Democratic Party.
Mr Sheldon argued the party was a "sick organisation" that should not rush to return to government before developing new policy and reforming itself.
Mr Howes, who like Mr Sheldon is a Labor national executive member, said on Wednesday the party was now polling one of its highest primary votes in six years under the leadership of former AWU boss Bill Shorten.
He said the relationship between unions and Labor should be reviewed.
"There would be benefits for the parliamentary wing of our movement to review and change the nature of its engagement with the industrial wing and there would be a hell of a lot of benefits for us, too," Mr Howes said.
"Because not always does that side of the movement (Labor MPs) shine glorious examples of leadership on us."
However, he did not believe voters cared about the structure of political parties or their internal affairs.
"I think they vote on the basis of what that party stands for and what the vision is for Australia," he said.