this is an obvious false positive - sipc.org is the legit website for a real anti-fraud investment organization, and it's only got bad ratings and comments here because the domain name was listed in a link in a spam email.
...just because a spam email puts a domain in their spam, does not mean the domain is a spam domain... spammers like putting trusted domains in their footers to look more "legit", and sipc.org is legit, which is why the spammers chose to put it in in the first place...