High Quality Content by WIKIPEDIA articles! Adolfo Calero Portocarrero (born December 22, 1931) was a Nicaraguan businessman, and leader of the Nicaraguan Democratic Force, which was the largest contra rebel group opposing the Sandinista government. In the contra leadership, Calero was responsible for managing the bank accounts into which money was deposited and then used to buy supplies and arms. He was brought to testify at U.S. Congressional hearings in May 1987.