Freikorps, right-wing groups, protested the Treaty of Versailles, which ordered their disbandment. Political violence and assassinations continued. In 1923, after Germany failed to pay reparations, French and Belgian troops occupied the Ruhr, seizing raw materials. Workers went on strike, but French forces killed and exiled many. This led to hyperinflation, as Germany printed money to pay reparations in worthless marks, benefiting from the worthless marks.