To report the fraud, go here:
http://www.grants.gov/web/grants/support/general-support/grant-fraud.html
Their number is listed , along with an email address, at the top of the page.
Also here:
http://www.consumer.ftc.gov/articles/0113-government-grant-scams

http://www.usa.gov/

To file complaints on Foreign company's and scams:
http://800notes.com/forum/ta-d20d86fdc3e145c/reporting-international-scams
https://www.econsumer.gov/#crnt
eConsumer.gov: Report Your Complaint
E-mail: econsumerwb@ftc.gov

Its ILLEGAL to ask for money to receive it:

Prize Offers: You Don’t Have to Pay to Play!
http://www.ftc.gov/bcp/edu/pubs/consumer/telemarketing/tel17.shtm
http://www.consumer.ftc.gov/scam-alerts
http://www.consumer.ftc.gov/articles/0076-telemarketing-scams

yep they called me  said i can recieve a 9000 $ grant   it cost me 745 $ so far  after the 500 payment  they said  we  will tranfer money in 30 min,   they called back and said  we goofed  we need another 798 $ from u to western union u the 9000 grant   so the price went from free goverment grant to   245 , to 500 ,  and then 798 more  and david  in at the bank in  california  conducting all this scam melvin green is a part of the scam too, i want US back to refund the 745 $$ they rightfully owe me now  US banks  are  all through out  the united states  so its simple cut me a check i pick it up and move on   or i will  tell everybody about the scam there pulling