Double-crossing, treachery, name-calling, suspicion, pettiness, lies and leaking have all fed some bitter feuds between politicians in Parliament.

Politicians are usually able to separate the politics from the personal enough to remain civil. But sometimes things turn ugly – even to the point of legal action.

The NZ Herald looks at the anatomy of some of the bitterest feuds in Parliament – and top of the list is Winston Peters and Paula Bennett.

Winston Peters and Paula Bennett: From fat jokes to court

Back in August 2016, Winston Peters challenged Paula Bennett to a running race through Maungaturoto, a small

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The Judas tale: Simon Bridges and Jami-Lee Ross

Accidental conflict: Winston Peters and Andrew Little

National Party MPs Judith Collins and Paula Bennett: competitive rivalry.

Speaker Trevor Mallard and National MP Nick Smith (and occasionally Paula Bennett and various other National MPs).

The Frenemies: National Party MP Judith Collins and Labour minister Phil Twyford

Old grudges: NZ First leader Winston Peters and National MP David Carter

The Clayton's Feud: NZ First's Shane Jones and Air NZ chief executive Christopher Luxon.