Labour membership is at present above half a million, with many of those new members being people badly affected by immigration, globalization, the housing crisis and the gig economy. Many of those persons on joining the Labour party also have their own added views on why the above problems have come about, and in that by example, racism can often be found close to condemnation of immigration.
Where Jeremy Corbyn has failed is to be found in the problems of controlling a movement now the size of the Labour party. Since becoming leader Corbyn more than any other leader since Atlee has encouraged the grassroots to have a far larger say in bringing forward Labour party policy.
In the above, is it any wonder that those large-scale grassroots views when put forward will at times contain people's reasoning of why the above problems have occurred and in that so affected them. Often unfounded misplaced blame can be placed on immigrants and the religious groupings contained within it which in the current situation has also brought forward anti-Semitism.
I believe that racism and anti-Semitic views are held in both major political parties, but with a membership of what is thought to be now no more than seventy thousand it is much easier to contain and control within the Conservative party. However, examples are easily found.