Jedi/Sith Purge is a technology that can be researched at the Jedi/Sith Temple in Tech Level 4. It costs 1250 Nova, and ensures that units that are converted by enemy Jedi or Sith, die instead of joining the enemy player. Converted buildings are destroyed. It is available to the Confederacy, Galactic Empire, Republic, and Trade Federation.
This technology is useful if the enemy uses a lot of Jedi, as it prevents the enemy from converting the player's units. The unit will die, but at least the enemy player won't have it on their side.
"Rather than let your forces fall into enemy hands, this defensive skill causes your units to destroy themselves rather than allow themselves to turn against you when they are converted by an opposing Jedi or Sith."
—Manual description