This is terribly sad. Diane Abbot has been a champion for BAME rights forever.
I feel this is just an excuse to remove her, due to her longevity of political service in Labour. Keir Starmer seems convinced he needs to remove all the old guard.
As for John Mann, I have no words.
Yes, she may have used the wrong words in her letter. But, I agree with her, there is a lot of historical prejudice in this world, which impacts on people of Jewish, Irish and Roma backgrounds. They have suffered and been persecuted over the centuries by those in power and by society in general at different times.
However, the racism that Black and people of colour face is very different.
It is based on colour, you cannot hide it, many of us have names that highlight our background: then we are discriminated against, persecuted, have to endure institutional/societal racism as a result. Our actual history and ancient civilisations are overlooked in school curricula. The colonisation of our ancestor's lands is seen as nothing, even history seems to ignore the consequences of this time in those lands, let alone those whose ancestors were enslaved for centuries. Before becoming second/third citizens in whatever country they happen to be born.
Our ancestors have had to fight for recognition even to be regarded as human or people capable of running their own lives.
Only now, are individual governments and families are acknowledging that impact.