Hmm..that's a tough one! I guess it would depend on what #4 was wanted for and how dangerous he might be. If he's wanted for being a serial killer, I probably wouldn't waste any time making an anonymous report to the necessary authorities so they could check him out.
If the crime were robbery or something similar, and not murder or assault and he didn't seem threatening and scary, I might strike up a neighborly conversation with him over something neutral, like the weather or local issues, and then try to work the conversation around to more personal questions that were something most new acquaintances talk about, like where did he live before he moved in next door and other questions about his past. If he seemed reluctant to make conversation about his past (because most people LOVE to talk about themselves when asked) then I would be pretty suspicious. I'd make a report.
Of course, if I was right I'd have to consider that he could possibly find out who turned him in. But if he were potentially dangerous, I'd have to take that chance instead of waiting until I woke up from my sleep with my new neighbor trying to kill me. Either way, I wouldn't feel safe living next to him, so might as well get it over with.
If I were wrong, then I guess I'd have to make a joke of it with him, if he found out. I'd hope he'd be glad I was such a vigilant neighbor who was concerned about the safety of her community.
In Canada we call 1-800-222-TIPS it s totally anonymous.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.