How can I check out the motives behind an organized "Taskforce"?

I believe there are many organizations out there (some call themselves “taskforces”) that claim to be one thing but are actually working on a hidden agenda that is just the opposite of what they want you to believe. How can I check into the motives of these “stealth” groups? Is there a website that lists them, their origins, and the people behind them?? (I have a particular taskforce in mind, but hesitate to name it here…)