WASHINGTON -- Miami's two Cuban-American lawmakers on Monday urged the Organization of American States to do more on behalf of victims of repression in Cuba.

Rep. Lincoln Diaz-Balart blasted OAS Secretary General Cesar Gaviria for failing to seek an investigation into the treatment of Cuban dissident Sebastian Arcos Bergnes by Havana authorities. Arcos was denied proper medical attention during and after his detention for political crimes, Diaz-Balart charged.

Diaz-Balart reiterated a call for the resignation of Gaviria, a former Colombian president who has spoken in favor of reversing Cuba's 1962 suspension from the hemispheric forum, and who turned to Cuban President Fidel Castro for help in winning the release of his kidnapped brother from Colombian guerrillas in 1996.

``Gaviria has used his position not to fight for democracy in Cuba as the OAS charter requires, but to condemn the current sanctions against the Cuban tyranny,'' Diaz-Balart said.

Gaviria declined to comment Monday.

Rep. Ileana Ros-Lehtinen, for her part, plans to testify today before the Inter-American Commission on Human Rights, the semi-autonomous investigating arm of the 34-nation forum.

Ros-Lehtinen plans to present evidence that Cubans were detained, harassed and beaten for having called for freedom at Masses last month held by Pope John Paul II, aides said.

Her testimony is the first on Cuba by a U.S. lawmaker, and will be incorporated into a report by the commission to be issued later this year. The commission, which has been increasingly critical of Cuba, is currently chaired by Venezuela, with other representatives from the United States, Chile, Haiti, Colombia, Barbados and Brazil.