So Pena's character is wearing a Che Guevara shirt and Wahlberg reads

I kind of get the Pena character being a Left winger, he is idealistic and easily led. Probably not long out of college. Wahlberg's character however, I see him as more of a reader of everything, trying to make sense of how he was originally betrayed.

Zmag is what he started reading right after saying "let's see what lies they are trying to sell us today".
Doesn't sound like he thinks much of that publication.
Can't say I'm familiar myself.