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Brexit - Article 50, 1st reading

To summarise a Huffington Post article,

The first reading of the Article 50 bill was approved by 498 votes to 114. A quarter of Labour MPs (listed below) defied a three-line whip and voted against.

Four Labour front benchers resigned before voting against:
Jo Stevens, shadow Welsh secretary
Tulip Siddiq, shadow minister for early years
Rachael Maskel, shadow environment secretary
Dawn Butler, shadow equalities minister

Several other frontbenchers voted against and a decision on their positions will be "taken at a later stage". Diane Abbott, the shadow home secretary and close ally of Corbyn, missed the vote due to illness, her office said. SNP MPs and seven of the nine Lib Dem MPs also voted against.

Labour rebels
Heidi Alexander (Lewisham East)
Rushanara Ali (Bethnal Green and Bow)
Graham Allen (Nottingham North)
Rosena Allin-Khan (Tooting)
Luciana Berger (Liverpool, Wavertree)
Ben Bradshaw (Exeter)
Kevin Brennan (Cardiff West)
Lyn Brown (West Ham)
Chris Bryant (Rhondda)
Karen Buck (Westminster North)
Dawn Butler (Labour - Brent Central)
Ruth Cadbury (Brentford and Isleworth)
Ann Clwyd (Cynon Valley)
Ann Coffey (Stockport)
Neil Coyle (Bermondsey and Old Southwark)
Mary Creagh (Wakefield)
Stella Creasy (Walthamstow)
Thangam Debbonaire (Bristol West)
Stephen Doughty (Cardiff South and Penarth)
Jim Dowd (Lewisham West and Penge)
Maria Eagle (Garston and Halewood)
Louise Ellman (Liverpool, Riverside)
Paul Farrelly (Newcastle-under-Lyme)
Vicky Foxcroft (Lewisham, Deptford)
Mike Gapes (Ilford South)
Lilian Greenwood (Nottingham South)
Helen Hayes (Dulwich and West Norwood)
Meg Hillier (Hackney South and Shoreditch)
Rupa Huq (Ealing Central and Acton)
Peter Kyle (Hove)
David Lammy (Tottenham)
Rachael Maskell (York Central)
Kerry McCarthy (Bristol East)
Catherine McKinnell (Newcastle upon Tyne North)
Madeleine Moon (Bridgend)
Ian Murray (Edinburgh South)
Stephen Pound (Ealing North)
Virendra Sharma (Ealing, Southall)
Tulip Siddiq (Hampstead and Kilburn)
Andy Slaughter (Hammersmith)
Jeff Smith (Manchester, Withington)
Owen Smith (Pontypridd)
Jo Stevens (Cardiff Central)
Stephen Timms (East Ham)
Catherine West (Hornsey and Wood Green)
Alan Whitehead (Southampton, Test)
Daniel Zeichner (Cambridge)

There would have been various reasons for those Labour members defying the whip:

The table below tries to capture some of these influences.The loyalty column relates to the extent of their support for Jeremy Corbyn.

A50

Sources
parliament.uk, Huffington Post.