https://www.spamcop.net/anonsignup.shtml
I’ve been using them to report spammers (including companies who can’t be bothered to fix their mailing list unsubscription mechanisms). It works by parsing mail headers, identifying the origin of the email and submitting email abuse reports to the operators of the relays that processed the unwanted email.
The only way to combat this is to vote the assholes out at the end of their term.
Extreme leftists are getting a little too comfortable all over the world it seems.