The story is about the stoning an innocent young woman for adultery by a group of radical religious hypocrites.
In the above sentence "radical religious hypocrites" is the subject who did the stoning. Is it correct grammatically use verb-ing followed by the subject? Or should it be "radical religious hypocrites' stoning of an innocent young woman"? Normally I would think that the noun following "-ing form by" is the instrument used to do the task (verb), rather than subject, e.g. "Opening the door by a key", "Sending a message by the phone" , and so on . Other examples I am skeptic of whose correctness include "reaching international ranks by hardworking athletes", "Opening new national developmental horizons by aerospace scientists", "importing a new class of SUVs by the government", "Watching porn by a frustrated guy", and so on.