As someone who, after being a Left member of the Australian Labor Party for over 40 years, joined the British Labour Party specifically to support Corbyn for the leadership, I am concerned about the direction that ‘Momentum” appears to be going. After witnessing firsthand the damage that Socialist Workers Party and Socialist Labour League entrism did to the Left in the ALP in the late 1970s/early 1980 ( effectively splitting the Left, ramifications of which have lasted a generation), this form of fractionalism can only benefit the right wing elements in Labour. Individual “trotskyists” have every right to advance their ideology within the Labour movement, but, organised Trotskyite Parties have no legitimate role within the Labour Party. Historically, Trotskyism has been divisive within the labour movement. Yet again this historical record would seem to be manifesting itself. The destruction of Corbyn’s leadership will justify the Trotskyite analysis that socialism cannot be acheived by a ‘Labour” Party no matter how leftwing its leadership and platform.