Q:

Verb in a sentence is missing

In the following sentence, I don't see that it is a complete sentence: 

Conformity is a virtue, creativity suspect, humor forbidden and voice mute. 

Can some one help me figure out how it can be grammatically correct?  It seems to me that the verb is missing. 

A:

A brief look in the google does not reveal the author of this sentence, and it is variously preceded by "In the legal profession", "In academia", and "In corporate America".  The verbs are omitted from the succeeding elements in the list.  This rhetorical device is called ellipsis.   Better punctuation will help:

Conformity is a virtue; creativity, suspect; humor, forbidden; and voice, mute. 

Now I'll add the implied, missing words in bold:

Conformity is a virtue.  Creativity is suspect.  Humor is forbidden.  And voice is mute.