The Mirabal sisters were four Dominican

Dominican Republic

The Dominican Republic is a nation on the island of La Hispaniola, part of the Greater Antilles archipelago in the Caribbean region. The western third of the island is occupied by the nation of Haiti, making Hispaniola one of two Caribbean islands that are shared by two countries...

 political dissidents who opposed the dictatorship of Rafael Trujillo. Three of the sisters were assassinated by unknown persons. In 1999, the United Nations

United Nations

The United Nations is an international organization whose stated aims are facilitating cooperation in international law, international security, economic development, social progress, human rights, and achievement of world peace...

 General Assembly

United Nations General Assembly

For two articles dealing with membership in the General Assembly, see:* General Assembly members* General Assembly observersThe United Nations General Assembly is one of the five principal organs of the United Nations and the only one in which all member nations have equal representation...

 designated November 25 (the anniversary of the murder of the Mirabal sisters) as the annual date for the International Day for the Elimination of Violence Against Women in their honor.
Patria Mercedes Mirabal (February 27, 1924 – November 25, 1960), Bélgica Adela "Dedé" Mirabal-Reyes (March 1, 1925 – present), María Argentina Minerva Mirabal (March 12, 1926 – November 25, 1960) and Antonia María Teresa Mirabal (October 15, 1935 – November 25, 1960) were citizens of the Dominican Republic

Dominican Republic

The Dominican Republic is a nation on the island of La Hispaniola, part of the Greater Antilles archipelago in the Caribbean region. The western third of the island is occupied by the nation of Haiti, making Hispaniola one of two Caribbean islands that are shared by two countries...

 who fervently opposed the dictator

Dictator

A dictator is a ruler who assumes sole and absolute power but without hereditary ascension such as an absolute monarch. When other states call the head of state of a particular state a dictator, that state is called a dictatorship...

ship of Rafael Trujillo.