General Augusto Pinochet deposed Socialist President Salvador Allende on September 11, 1973. Following the coup, the junta killed at least 3,000 people and captured tens of thousands of Chileans.
At the time of the coup, the 35-year-old Brotherus was the Chargé d'affaires in Santiago, having previously served as a trustee before. During the Allende administration, Finland cooperated extensively with Chile in the forest and mining sectors. Brotherus and Deputy Counselor Ilkka Jaamala's work was based on a secret decision made by them to act against the official guidelines of Foreign Ministry and Finnish asylum policy. They channeled aid by organizing refugees from the country. It is estimated that Brotherus was able to take 182[6] Chileans to Finland and 1,700 to East Germany, and that by the improvisation of Brotherus he was able to secure about 500 refugees. Brotherus' "balance" was up to 2,500 rescued people.
Matti Tuovinen [fi], Head of the Political Department of the Ministry of Foreign Affairs and other ministry officials tolerated Brotherus's activities. After five years in Chile, Brotherus' career continued as an ambassador in Tehran, Islamabad, Pretoria and Athens.[7][8]
After his retirement, Brotherus has continued human rights and solidarity work with free civic activities. He was awarded the Tammisaari Medal of the People's Education Fund in 2010.[9] The Finnish state recognized Brotherus’ work in Chile by Foreign Minister Alexander Stubb in the form of coffee and a bun.[10]