dancingalone
Grandmaster
Actually, during the unification movement, Hwang Kee was onboard at first but later pulled the Moo Duk Kwan out and kept his organization separate. Some (many) of his senior instructors, however, wanted to join the Taekwon-Do movement and so there was a split. You now have Soo Bahk Do Moo Duk Kwan, headed by Hwang Kee and now by his son, and Taekwon-Do Moo Duk Kwan, that branch of Taekwon-Do that traces its origin back to this schism.
Of course, there are also those who are doing Tang Soo Do Moo Duk Kwan, i.e. they didn't join Taekwon-Do but split from Hwang Kee for differeing reasons.
Pax,
Chris
That's as concise a summary as I've come across. Nice work.