On January 26th 2010 CONCORD collected ISK from capsuleer alliances claiming territory in null security space. While most alliances received the reminder to pay their bills certain alliances either chose to ignore it or claimed to have never gotten the reminder.
Due to these lost reminders and the subsequent failure to pay by several alliances CONCORD revoked their territorial claim on multiple solar systems. Several alliances were effected by this including Wildly Inappropriate., Legion of xXDEATHXx, and most notably GoonSwarm. For both Wildly Inappropriate. and Legion of xXDEATHXx the response was simply to pay the bills and reclaim the solar systems. GoonSwarm however was in the middle of a war with IT Alliance over the ownership of Delve.
IT Alliance used GoonSwarm's failure to pay as an opportunity to conquer key systems including what many considered to be the core system of Delve, NOL-M9.