Bolivian President Evo Morales has announced that his country is joining the regional investigation into Operation Condor alongside Argentina, Brazil, Paraguay and Uruguay.

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These latter nations created the Truth Commission to uncover the “Empire’s transgressions” during Operation Condor, the Bolivian head of state tweeted, referring to the United States.

Operation Condor was a covert, multinational “black operations” program organized by six Latin American states (Argentina, Bolivia, Brazil, Chile, Paraguay and Uruguay, later joined by Ecuador and Peru), with logistical, financial, and intelligence support from Washington,” according to J. Patrice McSherry, author of Predatory States: Operation Condor and Covert War in Latin America (2005). Their shared intent was to do away with leftist movements in the region.

Morales said he laments this shared history of human rights violations, but celebrates the “brave and dignified struggle against the military dictatorships."

For its part, Bolivia suffered under Operation Condor during its nearly 20-year dictatorship between 1964 and 1982.

Nila Heredia, who was named the country’s rights commission representative, said that Bolivia is giving “its full support (to the commission) with its experience (of working on other rights commissions, as well as technical expertise.”

Morales has also announced that Bolivia will host a seminary for experts from the Truth Commission on Feb. 20.

Estimates of the number of those killed or disappeared from the clandestine Operation Condor ranges from 20,000 to 60,000.