The white supremacy Ku Klux Klan group is delivering promotional leaflets to letterboxes and cars in a bid to recruit new people across America.
The flyers, found in Texas, Louisiana, Illinois and Pennsylvania, feature a person wearing the KKK robe with the words: "The KKK wants you!"
They also contain contact details and information for anyone wishing to join.
Sally Fowler, from the Texas town of Rhome, was one of several residents who received a leaflet from the Loyal White Knights.
"Oh yeah, I was repulsed," she told Texas News station KHOU. "It's offensive; it's shocking. You don't want that stuff in your neighbourhood."
Sheriff's Office spokesman Captain Kevin Benton said police haven't seen anything like this since the 1990s and the leaflets were a concern.
"We do not need that type of problem in Wise County, Texas," Benton said. "You wish it was something from the past, that you'd hope everyone had gotten beyond that".
According to the Southern Poverty Law Centre, an organisation that monitors hate groups, Texas has the most active KKK group.
The American far right organisation not only professes white supremacy, but is also against immigration, civil rights, interracial unions and communism.
The firs KKK group was born in 1865 in Tennessee and was guilty of murders against black and white Republicans.
A second group was formed in Atlanta in 1920. Its members demanded: "One Hundred Percent Americanism" as well as the purification of politics and better enforcement of prohibition.
Following the Second World War and the reemergence of the KKK, several members were convicted for the murder of civil rights workers and children.
Three KKK members shot four elderly black women in Chattanooga, Tennessee in 1980. Attempted murder charges were filed against the three but two were acquitted and the other sentenced to only 9 months jail or less by an all-white jury.
The Klan is today considered a "subversive or terrorist organisation" and it is believed to have more than 5,000 members across the US.
On the website kkk.com, the group claims to be fighting a race war against whites.