To break up the organisation of: Dissolve. (Merriam – Webster)
To break up as an organisation: Disperse. (Merriam – Webster)
If someone disbands a group of people, or if the group disbands, it stops operating as a single unit. (Collins Dictionary)
To stop being a group. (Cambridge Dictionary)
(with reference to an organised group) break up or cause to break up. (Oxford Dictionaries)
How to Disband Your Company.
E.P.A. to Disband a Key Scientific Review Panel on Air Pollution.