The Grigari are a powerful species from the fringes of the Beta Quadrant and may live in a territory that actually borders the Delta Quadrant. Their culture is based on piracy and, unlike the Ferengi, will resort to unsavory tactics to make profit.
Several Grigari forces were invited to Sector 001 in 2388 to take part in trade negotiations. However, the Grigari were confused by a transmission and opened fire. The Enterprise-F was destroyed by the Grigari in the process. (DS9: novel series: Millennium)