[Idiom] what is the meaning of "who stand to benefit, and who stand to gain"

[lldking]

How do I understand the meaning of "who stand to benefit, and who stand to gain"?

For example, "If from now on, the police failed to uphold law effectively, who stand to benefit, and who stand to gain.".

 

[emsr2d2]

That's not a complete sentence. As it stands, it doesn't mean anything. Should there have been a question mark at the end of your quote?

 

[lldking]

The quote "If from now on, the police failed to uphold law effectively, who stand to benefit, and who stand to gain." is original, and the end of it is not a question mark.
I thought "who stand to benefit, and who stand to gain" is a idiom.

 

[MikeNewYork]

It should end with a question mark no matter who wrote it.

 

[emsr2d2]

So now you know it should have a question mark at the end, can you understand it?