How much right do I have over the logo and other design works for an organization if they fire me?

Should I make them sign a contract or MOU stating that I have the whole right over the logo until I give them in written that they have copyright over the logo? Or is this even possible that I do not have rights over the logo.

Great design resource

100 Things Every Designer Needs to Know About People (Voices That Matter) Submitted April 12, 2019 at 05:08PM by DankDevilDabber http://bit.ly/2UvmMoC