Which of these was a leader and ideologist of Ukrainian nationalists?

Stepan Andriyovych Bandera (1 January 1909 – 15 October 1959) was a head of a militant wing of the Ukrainian independence movement and a leader and ideologist of Ukrainian nationalists.

Born in Austrian Galicia, into the family of a Greek-Catholic priest, he became nationalistic from an early age. After the dissolution of Austria-Hungary Galicia became a short-lived West Ukrainian People's Republic, but was quickly annexed by Poland and was subjected to an extensive campaign of Polonization and Pacification. He became radicalised during this time, and after Polish authorities refused his request to leave for Czechoslovakia for studying, he enrolled in Lviv Polytechnic where he organized several nationalistic organizations. He was imprisoned in 1934 and was sentenced to death, but his sentence was quickly commuted to life imprisonment. He escaped prison in 1939 when the Second Polish Republic collapsed after the joint Nazi-Soviet invasion and moved to the German-occupied zone.