I suppose it's not impossible, but it doesn't seem like the kind of thing that would attract them. The kinds of white supremacists under discussion here are thought to want to exert force, especially with weapons. We don't arm social services.

That said, there is a dangerous undercurrent of white supremacy in social services. It's of the nominally benevolent kind, where social workers bring biases and don't understand the communities they're serving. One example, it may seem that a white family is helping a black child by adopting it away from a much poorer black family with issues, but there are a lot of things a white family doesn't know how to prepare black children for, from their hair to dealing with police.

This is an incredibly difficult and thorny subject. I bring up one example that I happen to have a very distant and passing familiarity with, but don't intend it to give more than a vague hint of the complexity.

I bring it up only because, while it's not likely to be infiltrated by hate groups, white supremacy is a systemic problem in the US, including social work. Dealing with that requires constant feedback and self-inquiry, and ensuring that minority voices are genuinely listened to in the process.

Well put!