An Australian doctor claims he was the target of trumped up charges designed to thwart his tilt at the Ugandan presidency.
The Ugandan government last week dropped all charges against Sydney cardiologist Aggrey Kiyingi, which included terrorism, murder and crimes against humanity.
The crimes had been levelled against Dr Kiyingi last year after he was accused of orchestrating a wave of killings of top Muslim clerics in the east African country.
"These charges were ridiculous fabrications whose sole purpose was to stop me going back to Uganda to challenge the cowardly dictator Yoweri Museveni," Dr Kiyingi told AAP.
"The main thing was to stop me going back, to wreck my reputation, to threaten my supporters, and to continue a state of physical, mental, emotional and financial terrorism against the people of Uganda."
Six other suspects charged alongside Dr Kiyingi still face charges of terrorism, murder, attempted murder and aiding rebels who had plans to oust the sitting government.
Dr Kiyingi, 61, who migrated to Australia in the 1980s and has a practice in Sydney's west, said the six people must be set free.
"He (President Museveni) doesn't have an iota of evidence to prove any of those allegations," Dr Kiyingi said.
"My call to friends here in Australia and around the world, and to all governments who believe in freedom and human rights, this is the time to condemn this man in the strongest possible terms and to demand that all the other prisoners arrested on my account should be freed immediately and unconditionally."
Uganda's highest court last month rejected an opposition petition to nullify the results of the country's disputed February elections, clearing the way for President Museveni to govern for another five years.
Dr Kiyingi insisted that while he was unable to run in the election, he hadn't given up the fight to "liberate Ugandans".
"They've put their trust in me and I'll continue to be the voice to speak out loudly against this dictatorship," he said.
"The common means of the change of government have failed, and therefore the people of Uganda have got to start thinking of innovative ways to effect change."