I was kidding around, and part of the joke is how pointless the definition is:

communism: that the assets held by a body are indivisible across the individuals of that body when the assets in question are required to engage in production.

Thereby any definition of "body", "asset" and "production" can be used to define specific types and scopes of a communist ideology.

propaganda: a piece or collection of communications that has the primary purpose to persuade.

communist propaganda: a communication to persuade the reader to share the means of production across a collective.