The Ku Klux Klan (KKK) - or just the 'Klan'- first played a violent role against African Americans in the South during the Reconstruction Era of the 1860s. Members made their own white costumes: robes, masks, and conical hats, designed to be outlandish and terrifying, and to hide their identities. They became infamous for their parades with large burning crosses, and the lynching and hanging of their victims. Today, many sources classify the Klan as a subversive or terrorist organisation. In April 1997, FBI agents arrested four members of the True Knights of the Ku Klux Klan in Dallas for conspiracy to commit robbery and to blow up a natural gas processing plant. In 1999, the city council of Charleston, South Carolina passed a resolution declaring the Klan to be a terrorist organisation. It is estimated to have around 150 Klan "chapters" with between 5000 and 8000 members.