I went looking for the guide. Couldn't see it linked from the page linked here, so I followed their Gawker link, and couldn't see it there, so I followed the link to occupywallst.org. I couldn't get their embedded PDF viewer to turn pages, so I clicked the raw PDF.

To save others the trouble, the link is here: http://www.docdroid.net/file/view/86lk/walmart-on-ourwalmart...

A "Guide on How to Silence Workers" is not a good characterization of this document. From the post title, I expected something like "Here's how you subtly threaten and intimidate people into doing what you want." I don't see anything like that here. There are 13 slides. Several of them depict links between the UFCW, various anti-WalMart organizations, and one consulting group. A couple are pure propaganda along the lines of "Is OURWalMart/UFCW really here to help you? No!"

One of the organizations listed in the document is the same makingchangeatwalmart.org to which the OP links.

Maybe there are things about WalMart that one should get outraged about, but this doesn't seem like one of them. There's more heat than light here.