I am not and have never been a Labour party member.
Jeremy Corbyn and the Labour party are repeatedly accused of anti-Semitism. Many people recognise that these accusations are directed at Corbyn and the Labour party because Corbyn has traditionally shown sympathy to the Palestinian cause. These accusers will not be satisfied until Corbyn is deposed as leader.
The Labour party cannot accept anti-Semitism being conflated with anti-Zionism. Zionism and the Zionist project is a political ideology and movement. To conflate anti-Semitism and anti-Zionism would mean that discussions of Zionism and Israel would be censored.