It was a logical inconsistency in your question that put me onto the
right track. You described the movie as being set in 1960, but
dealing with the rise of Nazism.
Now, Nazism arose (of course) in the late 1930's. However, Frederick
Forsyth's "The Odessa File", a very popular thriller, is set in the
early 1960's. The plot revolves around a secretive group of former
Nazi officers, the Odessa, who (among other things)are attempting to
destroy the state of Israel by building rockets for Nasser's Egypt.
Their conspiracy is sniffed out by a young reporter, who turns out in
the end to have a personal reason for getting involved. This
character, in the 1974 movie version, was played by a young and very
blond Jon Voight. See the listing here, at the Internet Movie
Look at the posters and watch the trailer - or better yet, rent it, it
was a decent thriller - and I think you'll find it's the movie you're
looking for. The time frame, the theme, and the physical description
of the star all agree.
I'd read the book and seen the movie, so I was quite sure this was the
one. However, in all things film-related I turn to IMDB first, so I
went there to confirm the physical description of the male lead, and
the synopsis of the plot.
Thank you for a fun question to kick off the weekend!