I am writing a story that is set in the 1920s. Several of the characters in the story are either immigrants from southern or eastern Europe (e.g., Greece, Italy) or their children, and I'm trying to figure out the kinds of negative prejudices the characters might face because of their background. Due to the plot the characters also interact with the scientific community of the 1920s and the story also deals with the fact during the early 20th century many of the prominent scientists and intellectuals of the time such as Henry Fairfield Osborn were also eugenicists and had very unfavorably views to...pretty much anyone who wasn't an "Anglo-Saxon" in the interactions between characters.
However, when I have tried to research what the actual stereotypes Greek immigrants to the United States have had to face, I have come up with little. I have found that anti-Hellenistic sentiment was very much present during these times, as it was for most of the 'new immigrant' groups (e.g., Italians, Poles, Irish, Chinese, etc), but none of the sources really describe what form those prejudices took beyond "they didn't like Greek immigrants because they were foreigners". While not technically inaccurate, in these situations often more precise stereotypes emerge that influence people's behaviors, and oftentimes different groups suffer from being assigned different types of stereotypes.
I am aware what present day stereotypes there are regarding Greek-Americans, but have no idea if those stereotypes were present as well back then. Many of the modern Greek stereotypes seem to have arisen around the events of the 2008 Greek debt crisis. I am well aware of the specific prejudices that Italians faced when they immigrated to the New World, namely being regarded as "too dark-skinned", too Catholic, and being stereotyped as violent and criminal (a stereotype that got worse as organized crime began to gain power with Prohibition), but I have no idea if these stereotypes were more broadly believed with respect to other groups from southern and eastern Europe.
Given this, I am trying to find out what kind of negative prejudices and stereotypes did Greek immigrants or Greek-Americans face in the United States?