Answer
In 2005, Jörg Haider left the Freedom Party and formed BZÖ. He did this after losing a power struggle with the party's chairman, Heinz-Christian Strache. Haider's departure from the Freedom Party was controversial, and it led to a split in the party. Haider's new party, the BZÖ, was seen as more moderate than the Freedom Party, and it attracted many voters who were disillusioned with Haider's former party.