He attended Kaunas "Aušros" high school [lt], where he joined the catholic youth organization Ateitis and the far-right, anti-semitic and anti-Soviet Lithuanian Activist Front (LAF).

[2] At the end of 1947, along with fellow partisans Jurgis Krikščiūnas-Rimvydas and Kazimieras Pyplys-Mažytis, Lukša crossed through the Iron Curtain with the goal of attracting support for the fighters and establishing contacts with Lithuanians in exile.

During his stay in the West, Lukša wrote Fighters for Freedom (Lithuanian: Partizanai už geležinės uždangos), a firsthand account of partisan activities in 1944–47.

"[9][10] The Central European University Press published a fresh English translation of Lukša's book in 2009 under the title Forest Brothers: The Account of an Anti-Soviet Lithuanian Freedom Fighter, 1944-1948, ISBN 978-9639776371.

According to multiple witnesses, Lukša was a participant in the 1941 Lietukis garage massacres in Kaunas, and allegedly took part in the murder and decapitation of Rabbi Zalman Osovsky.