Salman Rushdie attacked on stage in New York

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But it is not allowed! How do they allow him to be the supreme leader?

I think is a bit too much depth to that story to cover that in this thread.
 
"What others do giving fatwas to stab him is also not allowed in Islam."

So, what happened to them? Did they go to prison for giving fatwas since it is not allowed?

No because they sit in their insulated nations. Did Tony Blair go to a world prison for killing half a million children with a clearly proven illegal war based on clearly proven lies? No. Same with the ayatollah and other dodgy Muftis sitting around the world in protected nations.
 
But it is not allowed! How do they allow him to be the supreme leader?

I imagine understandably that you probably won't read any books about it. But you could always get the gist of it from Wikipedia and I imagine there are good documentaries on the subject.