The right wing Red Watch website features pictures of Mr Hume and other members of the party at demonstrations or events in the past.
It urges anyone with information about the 'fenian reds, causing trouble' or 'freaks' would be 'gratefully received.'

'Journal' columnist and author, Eamon McCann, is also pictured on the website.

A spokesperson for the SDLP said: "We are very concerned that postings attacking John Hume and other party colleagues have appeared on this sinister website.

"Since this matter has been brought to our party's attention, we have alerted the police who have informed us that they have been monitoring this website for a while now as this organisation appears to be engaged in hi-tech fascism."

The party spokesperson branded those behind the website 'lunatics'.

"The SDLP will not be deterred from standing up for the rights of others. We have faced down threats before and we will continue to do what is right as we strive to fight against racism, sectarianism and bigotry."