The most important was the Forum for Democratic Change, the leadership of which had changed from Col. (ret).
His Forum for Democratic Change will contest 295 of the 330 parliamentary seats.
The Heartland Institute, founded in 1984, has built a reputation over the years for providing a forum for climate change sceptics.
Interim chairman Joseph Opit used to belong to the opposition Forum for Democratic Change, for instance, but has since crossed over to Museveni's NRM.
Mr. Besigye, who leads Uganda's biggest opposition party, Forum for Democratic Change, lost a presidential election last year to President Yoweri Museveni, who has been in power for over 26 years.
The arrest of Kizza Besigye and a number of his associates prompted around 3,000 people to gather outside the Kampala police station where the Forum for Democratic Change leader was held.
Phil Twyford, advocacy director of Oxfam, which helped mount the global campaign against farm subsidies, said that with the United States now the sole superpower, his group believed that multilateral institutions were a proper forum for wresting change for the world's poorest nations.
Alice Alaso, the secretary general of the Forum for Democratic Change, Uganda's main opposition party, who is also the MP for Soroti district, welcomed the screening campaign, saying it would help reduce the disease burden mostly among the rural woman who face the challenge of travelling to Kampala to be tested.
In 2008, Nabilah Sempala, an opposition MP for Kampala district representing the Forum for Democratic Change (FDC), had been trying to leave suggestion boxes at a busy market when she was arrested and had her skirt hoisted up by a male officer.
