Insider trading?

I can't believe that "insider trading" by the U.S. Congress is still legal!  For some reason, I assumed it had been outlawed when most other forms of "insider trading" had been outlawed.  

But nooooo, it's going to take a new law to "...require members of Congress and high-ranking staffers and federal employees to abide by insider trading rules that apply to everyone."

Link

That doesn't sound too good.  Making Congress obey the same laws that everyone else has to!!??  Where will it end?!

Surely there must be some rules already in place?  Ethics, conflicts of interest?