The academic source Webster University states regarding General Prosper Avril; "Avril joined the Presidential Guard in 1969 and Papa Doc nicknamed Avril the "intelligent Prosper Avril." In 1971 Avril profited from the shift of power from François to Jean-Claude Duvalier and from weapons procurement and other programs in the 70s and was entrusted by the Duvaliers as their "bagman" with management of much of their overseas portfolio. He was "the only person other than the Duvaliers themselves with signature authority over their foreign accounts." Avril was forced into retirement by Jean-Claude Duvalier in 1983, but reinstated and promoted to Colonel in 1986, in the face of the popular revolt which would ultimately see Duvalier overthrown. Avril's 1986 joining of Henri Namphy's interim military junta saw protest demonstrations, and he was forced to resign; but he quickly returned, and assisted Namphy in the June 1988 Haitian coup d'état which overthrew Leslie Manigat, who had been elected in military-controlled elections and took office in February 1988.
"A US District Court found that his regime engaged in a ‘systematic pattern of egregious human rights abuses’. It also found him personally responsible for enough ‘torture and cruel, inhuman or degrading treatment’ to award six of his victims a total of $41 million in compensation. The victims included opposition politicians, union leaders, scholars, even a doctor trying to practise community medicine. Avril's repression was not subtle: three torture victims were paraded on national television with their faces grotesquely swollen, their limbs bruised and their clothing covered with blood. He suspended 37 articles of the constitution, and declared a state of siege."
In December 1994 the Haitian police attempted to arrest Avril at his home, but were thwarted by the appearance of US soldiers, who caused sufficient delay that Avril was able to escape. "Police searching Avril's house found military uniforms, illegal police radios and a cache of weapons." He was finally arrested in 2001, shortly after Jean-Bertrand Aristide was elected President, for allegedly plotting against the state. Amnesty International said his arrest could be step forward for Haitian justice, and called for Avril to be tried for the grave human rights violations committed under his Presidency. Avril was freed on 2 March 2004, a few days after Aristide was ousted in the 2004 Haitian coup d'état.
At the time Aristide came to power, Prosper Avril lived in Miami, Florida under an assumed name despite the fact that he would be easily recognizable. This high-profile also made him the target of rumors, and so when two Haitian radio journalists were assassinated during the first weeks and month after Aristide took power, Avril became the target of rumors that declared his involvement. He recounts this experience in his book, An Appeal to History: The Truth about a Singular Lawsuit.