Hilkkoth Akum

Ah ha! I see I’ve stumped SDMB so far!
I guess I should give some details and hope Zev or another jewish poster pops in.
According to one of those websites, the Hilkkoth Akum has something to do with the Talmud. It supposedly has a section that says that Jews are not to save Christians in danger of death.
Now I’m sure there’s some twisting or downright lying going on, I’d just like to know if the Hilkkoth Akum is real since the only thing Google brings up are hate sites.