Yeah. Thank you. That's the problem, the story is old and has many variants.

Prussian helmet, nazi uniform, etc.

The searching led me to other credible info though, a scapegoating, anti-Jewish play supposedly written by P.E. Trudeau in his school days, named in French; "Dupés." (Duped, or The Duped.)

It is known and publicized, with dates, school performed at, etc, but... I can't find the script itself, so far... (I may put out another call similar to this post about finding the play.)

Either way, it seems like it may explain a few decisions around here...

Thanks^^