Why does the FBI spy on and infiltrate American citizen groups?

... but only when they challenge the status quo?

Isn't that "unAmerican?" And why is it not the lead story in the American media?

"Totally integrated corporate-state repression of dissent" is what The Guardian calls it.

Here is part of the story:

The Partnership for Civil Justice Fund, in a groundbreaking scoop that should once more shame major US media outlets (why are nonprofits now some of the only entities in America left breaking major civil liberties news?), filed this request. The document – reproduced here in an easily searchable format – shows a terrifying network of coordinated DHS, FBI, police, regional fusion center, and private-sector activity so completely merged into one another that the monstrous whole is, in fact, one entity: in some cases, bearing a single name, the Domestic Security Alliance Council. And it reveals this merged entity to have one centrally planned, locally executed mission. The documents, in short, show the cops and DHS working for and with banks to target, arrest, and politically disable peaceful American citizens.

Read more:

http://www.guardian.co.uk/commentisfree/2012/dec/29/fbi-coordinated-crackdown-occupy

See the documents here:

http://www.justiceonline.org/commentary/fbi-files-ows.html

We've seen this before, no?