Federal Labor leader Anthony Albanese has warned his colleagues against leaking, saying a united voice is needed once the party's stance is made on an issue.
Federal Labor politicians have been given a stern warning to not leak information to journalists, after the opposition's position on tax cuts made its way into the public sphere.
Labor leader Anthony Albanese raised the issue at a caucus meeting in Canberra on Monday, ahead of parliament's return on Tuesday.
He reiterated to colleagues that leaking does not help the party's cause.
Labor frontbencher Joel Fitzgibbon said Mr Albanese told caucus it's important to stick behind the party's position once it has been made.
"There has been some leaking. That's a matter of fact," Mr Fitzgibbon told ABC News after the meeting.
"When you get leaks from the senior ranks of the party, that is unhelpful to the party and its prospects.
"Unity also gives us the best prospects of success at the next election."
Mr Fitzgibbon suggested leaks have occurred as a way for some colleagues to deal with the pain of losing the election.
Monday's caucus meeting is only the second time Labor's new team has gathered, with the first meeting held at the end of May.
Labor's position on tax cuts has been a prime focus of political debate, with rumours of the opposition's stance swirling ahead of its shadow cabinet meeting last week.