They were so sure I was part of a national organization.

They were all a part of an organization that I was outside.

"You're a part of their organization and they care about you."

"Be on the same page, part of an organization with a plan."

After all, you are an essential part of my whole organization.

"Are you absolutely certain that these men aren't part of your organization?"

A department is a part of a larger organization with a specific responsibility.

He had given the impression they were part of a large organization.

"He is part of our organization, and we felt signing him was the right thing to do."

"And she's going to be a part of our little organization, you say?"