Ohariū MP Hon Peter Dunne is slamming pamphlets circulated by The Rolling Thunder which contains "disgraceful, despicable racist bigotry".
Mr Dunne says two pamphlets regarding Treaty of Waitangi issues were dropped into letterboxes in his electorate recently.
The Rolling Thunder is the name of a campaign under deregistered political party 1LawForAll.
Both pamphlets are published by John McLean and Tross Publishing. The Wellington-based author has also written an anti-separatist book, which former National leader Don Brash has contributed to.
The circulars promote the anti-separist values that Mclean discusses in his book.
Don Brash told Newshub he had nothing to do with the pamphlets.
Mr Dunne, however, is less than impressed that the same rhetoric keeps appearing.
"I acknowledge the right to free speech, but I am nonetheless outraged that this type of nasty, racist drivel is being circulated by some anonymous group," The United Future leader says.
Hon Peter Dunne wants people equally as offended as he is to throw them out.
"Hundreds and thousands" of pamphlets were reportedly distributed around the North Island by 1LawForAll on Saturday, promoting both the abolishment of the Treaty of Waitangi and McLean's book.