This is the 1213th most frequent Turkish word.
örgütünün
"Of the organization" or "belonging to the organization."
Here, 'örgütünün' is used in possessive form, indicating ownership of the 'örgüt' (organization) regarding the success story.
Bu kitap, örgütünün başarı hikayesini anlatıyor.
This book tells the success story of the organization.
In this context, 'örgütünün' again appears in possessive form, specifying that the members belong to the organization.
Polis, örgütünün tüm üyelerini tutukladı.
The police arrested all members of the organization.
'Örgütünün' here denotes possession, linking the ideology to the organization.