Hi guys, it was soooo long time ago when i asked my last translation, and now you can see i was changing: my questions become shorter and shorter

There was something what I tried to translate, but there is a word what i can't find anywhere... What is "apo" ? Is it a name, a person, or an organisation?

Probably, it's a nickname. An abbreviation of Abdullah (a male name)

I think the context would help-how was it in a sentence?

Yes, it's a shortened form of the name Abdullah. You'll see this with many names in Turkish. For example, Ibrahim becomes "Ibo", Fatma becomes "Fatos" or "Fadik", Zeynep becomes "Zeyno". You get the idea. It's just as confusing as William becoming "Billy" or Richard becoming "Dick" in English.

Just saying Apo was enough for us to know who: the leader of the PKK (Kurdish group) who was arrested and charged with leading a terrorist group. He is currently in prison. The death sentence has been passed, but not yet implemented (many think it never will - who knows).

His name is Abdullah Öcalan.

This is confirmed by the Turkish sentence. Diyarbakir Apo Fan Club (Diyarbakir is a major city in SE Turkey with a large Kurdish population)