Zack Polanski has signalled a potential overhaul of the Green party’s cherished grassroots democracy, calling for leaders to have greater control over strategic direction after a divisive vote equating Zionism with racism.The Green party leader has also questioned whether political parties should seek to define what members believe, in his strongest criticism yet of a motion that has provoked bitter divisions, international condemnation and calls for his resignation.Writing for the Guardian after his defeat in the Holborn and St Pancras byelection, Polanski suggests the party’s focus on defining Zionism has been misguided, even though he agrees with the substance of...