And here we go again. Let me pull out a citation from a book I read called "Get Your Knee off Our Necks."
“In the early years of immigration the poor Irish and blacks were thrown together, very much part of the same class competing for the same jobs.
An article by a black writer in an 1860 edition of the Liberator explained how the Irish ultimately attained their objectives: "Fifteen or twenty years ago, a Catholic priest in Philadelphia said to the Irish people in that city, 'You are all poor, and chiefly laborers, the blacks are poor laborers; many of the native whites are laborers; now, if you wish to succeed, you must do everything that they do, no matter how degrading, and do it for less than they can afford to do it for.' The Irish adopted this plan; they lived on less than the Americans could live upon, and worked for less, and the result is, that nearly all the menial employments are monopolized by the Irish, who now get as good prices as anybody. There were other avenues open to American white men, and though they have suffered much, the chief support of the Irish has come from the places from which we have been crowded."
Once the Irish secured themselves in those jobs, they made sure blacks were kept out. They realized that as long as they continued to work alongside blacks, they would be considered no different. Later, as Irish became prominent in the labor movement, African Americans were excluded from participation. In fact, one of the primary themes of How the Irish Became White is the way in which left labor historians, such as the highly acclaimed Herbert Gutman, have not paid sufficient attention to the problem of race in the development of the labor movement.
And so, we have the tragic story of how one oppressed "race," Irish Catholics, learned how to collaborate in the oppression of another "race," Africans in America, in order to secure their place in the white republic. Becoming white meant losing their greenness, i.e., their Irish cultural heritage and the legacy of oppression and discrimination back home.” -Art McDonald, Ph.D., “How the Irish Became White”
The Polish had a similar experience.
The Poles, in other words, were not considered white. Far from it: they were considered a mysterious menace that should be expelled. When Polish-American Leon Czolgosz killed President William McKinley in 1901, all Poles were deemed potential violent anarchists.
But then something changed. In 1919, Irish gangs in blackface attacked Polish neighborhoods in Chicago in an attempt to convince Poles, and other Eastern European groups, that they, too, were “white” and should join them in the fight against blacks. As historian David R. Roediger recalls, “Poles argued that the riot was a conflict between blacks and whites, with Poles abstaining because they belonged to neither group.” But the Irish gangs considered whiteness, as is often the case in America, as anti-blackness. And as in the early 20th century Chicago experienced an influx not only of white immigrants from Europe, but blacks from the South, white groups who felt threatened by black arrivals decided that it would be politically advantageous if the Poles were considered white as well.
With that new white identity came the ability to practice the discrimination they had once endured.
Over time, the strategy of positioning Poles as “white” against a dark-skinned “other” was successful. Poles came to consider themselves white, and more importantly, they came to be considered white by their fellow Americans, as did Italians, Greeks, Jews, Russians, and others from Southern and Eastern Europe, all of whom held an ambivalent racial status in U.S. society. Also, intermarriage between white ethnic groups led some to embrace a broader white identity.”-Sarah Kendzior, How do you become “white” in America?
In both instances, these groups stepped on blacks when they had the chance to unify and end the oppression of both sides to advance themselves.