Please don't be hung up on the word "left" - by that I just mean anti-capitalist/anti-oppressive allies.

I was curious about what people thought regarding the unconscious and unfair biases prevalent within leftist communities. Moreover, how we can become more conscious of these biases, and accommodate those who are being excluded.

The question was prompted by a friend of mine (with a learning disability) who finds a lot of the language leftists use inaccessible to him.