I think you did a great job making this but I agree with the majority of the comments here about it being too obviously leftist, too agitational, too much words in general, etc

Joining a union, for the average non politicized person, is a lot of work that can come with a lot of grief. You need to make it look easy and valuable. most people don't have the attention span to even read the first cover of a pamphlet. The other comments have described a lot of improvements so I won't reiterate them but you are doing a great thing and keep up the good work