Go back to late Winter to early Spring of 1945. It was approaching the end of WW II. Germans forces were facing decimation within their ranks. Hitler called up members of his “Hitler Youth” to take up arms to repel the Allies. Minimum age to join the German Army was 18 years. Some forged documents and ran away from home to save the Fatherland. Recorded ages of some were as young as 14 and younger. Could it be said the Hitler Youth was a form of indoctrination annd extremism?

How about as recent with the was between Russia and Ukraine. Putin ordered the rounding up of Ukrainian children to be indoctrinated into the pure Russian Culture.