If I understand the question correctly, it is being asked who to call if you have been the victim of a "greencard marriage", which in context suggest that a U.S. citizen was conned into marriage by a foreign national.
Fraud is fraud. I'm as much for immigrants rights as any, but your first contact should be your local police department. From there you'll probably be talking to the District Attorney. And the agencies to call are Immigration Control and Enforcement (ICE).
As to Homeland Security, that would probably only be needful if there is some terroristic aspect to this. However, if in doubt, you can call them, explain the situation, and see if it falls under their jurisdiction.
Note of caution: Before setting in to motion the massively ponderous machinery that is our Federal Government, are you sure?
By that I mean that there is an enormity of difference between someone marrying you, and then right on the day they get their papers, laugh and say "so long", versus you two were together after the marriage for some time, but a long series of difficulties and arguments led one to believe it just couldn't work out.
You do need a Green Card to work in the US. The best places to contact are Homeland Security and USCIS as they will offer you the information you need, and what you will require in order to apply for one.
Certified Ethical Hacker for homeland security :]
The United States government has the best website for information on Homeland Security training. This center also accododates Fema training. http://cdp.dhs.gov/
If by fixed you mean fake then yes, you can. Contact your local Dept. of Homeland Security office with as much information as you have (names, addresses etc.).
homeland security, in 2002
Search the USAJOBS site.
c bullet from homeland housewares.Am in south africa and wanna desperately place special offer available. Can Homeland housewares please contact me.
Yes off course homeland security increased the security
Joint Publication 3-26, Homeland Security National Strategy for Homeland Security
the department of homeland security
Depends on what your job is in Homeland Security.
You can contact your local law enforcement agency for more information on Homeland Security training. There is likely a lot of red tape involved with taking this kind of training.