New Essentialists

From Memory Alpha, the free Star Trek reference.

The New Essentialists were a group lead by Pascal Fullerton, who led a campaign to turn the Federation away from its perceived decadence.

In the early 2370s, their main target was Risa, as they saw it as the main problem. The group successfully sabotaged Risa's weather modification network in 2373 and attempted to do the same to the planet's vital seismic regulators. They were partially assisted for a short while by Lieutenant Commander Worf; however, Worf realized their actions were not in the best interest of the Federation, and along with his girlfriend, Jadzia Dax, was able to resolve the situation. (DS9: "Let He Who Is Without Sin...")