Kevin Rudd has made a dramatic call for Labor Party reform on the 10th anniversary of his taking the ALP leadership - and delivered a thinly-veiled swipe at Bill Shorten in the process.

And in an opinion piece written for Fairfax Media, the former prime minister warns Labor that the Coalition are not sentimentalists and will act to remove Malcolm Turnbull before the next election, if necessary.

Mr Rudd's second foray into domestic Australian politics in as many months follows Mr Turnbull's decision not to back him for the job of United Nations secretary-general, and after a long preceding silence.

The former leader's comments are quite clearly aimed at Mr Shorten, and other factional leaders of the ALP. Mr Rudd argues that "it's time for the formation of a new Labor reform movement". He outlines a series of key changes to ensure the defeat of the Coalition at the next election, and to ensure the party membership starts to broaden and grow again.