Nonini shared a letter signed by MCSK CEO Ezekiel Mutua announcing he is no longer a member of the body on his social media platforms.
In the letter, it was clear that he applied to terminate his membership with MCSK in February this year.
The termination came into effect on May 18.
Nonini said it was time he moves to something that works better for him.
"We need to take affirmative actions like this one. We have the power," he wrote.
"Insanity is doing the same thing over and over and expecting different results. Moving on to something that actually works."
In a different post, Nonini said change is the only thing that can bring better leadership.
"The human society is the extension of the individual," he wrote.
"If we really want a radical change in anything, if we want a better world, better leadership and better structures.
"We need to change the things that are not working by understanding you have the power individually. It starts with one person."
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