'hearth') is the particular religious community which adherents of Alevism belong to.
In Alevi tradition, each ocak is led by a dede, who is assumed to be descended from sayyids.
[1][2] Ocaks are interconnected and there is a familial connection between them.
At the top of the family tree is Haji Bektash Veli.
[3] There are Dede ocaks in Turkey whose hierarchy has not been established due to the lack of research.