The sites listed below are from Sojourners Magazine. I will list them in a typelist called "Muckrakers" as I have a chance to review them. There is tons of information online for looking into corporate practices.
www.coopamerica.org
www.sweatshops.org
www.stopcorporateabuse.org
www.business-ethics.org
www.adbusters.org
www.corpwatch.org
www.prwatch.org
www.multinationalmonitor.org
www.corporate policy.org
www.newdream.org/consumer/marketplace.php
globalexchange.org
ifat.org
lccr.org
fairtradefederation.org
transfairusa.org