Three points

1)  bigotries can proliferate on the left as exceptions to its supposed commitments to equality and freedom

2)  the case of misogyny in the mostly male-led left, and  . . . 

3) that other thing

To abolish class

Abolishing communist notions of class advances the final abolishing or all racist categories - a long overdue reform. The battle against racism starts here.

Capital, vol. 3, chapter 47: "The possibility is here presented for definite economic development taking place, depending, of course, upon favourable circumstances, inborn racial characteristics, etc."

Engels: (Marx and Engels, Selected Works, Vol. 3, p. 502.): "We regard economic conditions as the factor which ultimately determines historical development. But race is itself an economic factor".