Sutan Sjahrir
Santoso went to The Hague, in the Netherlands, in 1929 with her father, who was furthering his studies. Santoso then enrolled at Leiden University in Leiden, from which she graduated in 1933 with a Meester in de Rechten (Master of Laws) degree; this made her the first Indonesian woman to earn a law degree. During her studies, she became involved with the Indonesian nationalist movement and its leaders, including Mohammad Hatta and Sutan Sjahrir.