Labor groups up to and including in the 60s were fiercely anti-immigration [1], and wanted to expand laws like the Chinese Exclusion act. You would call them white supremacist today. But as you say, the FBI did its job, and eventually the unions accepted immigration, just like capital wanted. Now Amazon can release a study showing diversity impedes unions [2], and Wikipedia helpfully summarizes it to give the opposite impression [3], while the FBI can better spend its time investigating "It's okay to be white" as terrorism [4], libeling whites with fabricated extremism cases [5], and taking instruction from the ADL [6].
[1] https://en.wikipedia.org/wiki/Immigration_policies_of_Americ...
[2] Whole Foods' heat map says lower rates of racial diversity increase unionization risks - https://www.businessinsider.com/whole-foods-tracks-unionizat...
[3] Factors including racial diversity, proximity to other unions, poverty levels in the surrounding community, and calls to the NLRB were named as contributors to "unionization risk." - https://en.wikipedia.org/wiki/Criticism_of_Amazon
[4] Ohio universities involve FBI in investigation of ‘It’s okay to be white’ and white nationalist group’s postings on campus - https://www.thefire.org/news/ohio-universities-involve-fbi-i...
[5] https://www.washingtontimes.com/news/2022/sep/15/biden-accus...
[6] Did you know ADL trains every new FBI agent on their role as protectors of the American people and the Constitution? - https://x.com/ADL/status/472384478464061441
"You would call [groups from a time when white supremacy was widespread and socially acceptable] white supremacist today" is not the gotcha you seem to think it is.