Finally the Seyyeds are blocked by the US

"As a result of today's action, U.S. financial institutions are no
longer allowed to process these U-turn transfers," the department
said. "This regulatory action will close the last general entry point
for Iran to the U.S. financial system."

http://news.xinhuanet.com/english/2008-11/07/content_10319407.htm

It has taken this long for the US to block the Seyyeds. Why did it
have to take this long?