My limited understanding of the US law in regards to this is that if something is illegal in the US, the US persons are liable even if they commit the crime abr

My limited understanding of the US law in regards to this is that if something is illegal in the US, the US persons are liable even if they commit the crime abroad. So they should still be criminally liable. Australia should have something similar, but I know even less about the relevant details. I wish I could be of more help.