Matter of business with reasonable complaint

I've never understand this statement in reference to "The Turk". They show how he is good with a knife but I may just not realize how this part is explained by the following events. Turnbull can you or some explain?

Also what happened to all the old threads? Used to be tons of them.

At the bottom of the list of threads, there's a drop down menu that defaults to seeing the last year of threads. You can change that to All Threads.

Tom wanted Vito to make a deal with Sollozzo. I think he was trying to assuage Vito by explaining that the Turk would be a reliable business partner, not a quick-to-kill hothead. From Sol's viewpoint, killing Vito was "a matter of business with a reasonable complaint": Vito's refusal to give him police/political protection in return for a big share of Sol's drug profits was preventing Sol from doing business.

That was what I had in my head, the murder. That Tom was also talking Sol up I didn't take I to account.

I think they said he was known as a Turk, I don't think it was his nickname, but I have not seen th movie in while and may be wrong on this. I think the term "Turk" means an independent operator as opposed to the member of a Family.

When Tom met with Vito and Sonny after Hollywood to discuss the Sol meeting, he said Sol was known as the Turk because he had a Turkish wife and kids, and because he was quick with the knife.

Turk may be short for turkey. As in "jive turkey".