f to much better, more natural defaults, so that each
organization can decide what it means for a valid endorsement.</p>
<p>Further granularity and control can be achieved if you include [<cite>NodeOUs</cite>](msp.html#organizational-units) in your
organization definition. Organization Units (OUs) are defined in the Fabric CA
client configuration file and can be associated with an identity when it is
created. In Fabric, <cite>NodeOUs</cite> provide a way to classify identities in a digital
certificate hiera