Political parties in Uganda were restricted in their activities beginning that year, in a measure ostensibly designed to reduce sectarian violence. In the non-party "Movement" system instituted by Museveni, political parties continued to exist, but they could operate only a headquarters office. They could not open branches, hold rallies, or field candidates directly (although electoral candidates could belong to political parties). A constitutional referendum cancelled this nineteen-year ban on multi-party politics in July 2005.