DuBois on White workers in Black Reconstruction:

"the majority of the world's laborers, by the insistence of white labor, became the basis of a system of industry which ruined democracy and showed its perfect fruit in World War and Depression."

"The poor white clung frantically to the planter; and although ignorant and impoverished, victims of a war fought largely by the poor white for the benefit of the rich, they sought redress by demanding unity of white against black, and not unity of poor against rich"

Ture and Hamilton discuss the conditions for a coalition:

"The major mistake made by exponents of the coalition theory is that they advocate alliances with groups which have never had as their central goal the necessarily total revamping of the society"

(Even now white radicals continue to want to uphold white institutions)

“We do not believe it possible to form meaningful coalitions unless both or all parties are not only willing but believe it absolutely necessary to challenge Anglo-conformity“

On Unions:

“The AFL pursued that power and eventually won it, but generally remained tied to the values and principles of the society as it was. They simply wanted in”

DuBois:

One can see for these reasons why labor organizers and agitators made such small headway in the South. They were, for the most part, appealing to laborers who would rather have low wages upon which they could eke out an existence than see colored labor with a decent wage

Here Ture and Hamilton explain how white people must be part of a movement but explains how the are not doing enough and that they should do more than piggy backing off the black liberation struggle and should create their own too

Here they state explicitly that a poor black and poor white alliance is possible but that only poor whites can organise racist white areas and he interrogates why it is they aren’t currently doing that

"Ultimately, the gains of our struggle will be meaningful only when consolidated by viable coalitions between blacks and whites who accept each other as co-equal partners and who identify their goals as politically and economically similar"

From Black Reconstruction by DuBois:

https://libcom.org/files/black_reconstruction_an_essay_toward_a_history_of_.pdf

And "The Myths of Coalition" from "Black Power: The Politics of Liberation in America" by Ture and Hamilton:

https://www.jstor.org/stable/25594984?seq=1#metadata_info_tab_contents

Also read this thread: https://twitter.com/aiukliAfrika/status/1212467306061844482?s=20