The part about Esperanto speakers makes sense from a twisted perspective. The Nazis would figure they were progressive and/or internationally-minded persons, likely to become activists. In point of fact, most people in general do not become activists, just as a baseline.
Esperanto was denounced by both Hitler and Stalin. The latter describing it as "the language of spies" and ordering various repressions, the banning of it's use or teaching, suppression of the (formerly recognised) Soviet Esperanto Association and the internal exile of activists and speakers. Generally speaking Esperanto wasn't alone sufficient for execution, but it was highly suspicious. At least until 1941 when Stalin ordered a more intense crackdown, with numerous executions as well as exile.
Hitler mentioned Esperanto in
Mein Kampf describing it as a language intended to unite "International Jewry" and aid in their enslavement of non-Jews.
As long as the Jew has not become the master of the other peoples, he must, whether he likes it or not, speak their languages, and only if they would be his slaves then they might all speak a universal language so that their domination will be made easier (Esperanto!).
Historically the French also disliked Esperanto, frustrating the efforts to have it used by the League of Nations.
Though in a universe a few points to peppermint where they lose the Great War it becomes of of the principal languages of the LoN equivalent, gradually becomes the second language of Europe and spawns numerous conspiracy theories.
In general Nazis regarded Esperanto speakers as enemies of the state because they were a movement founded by a Jew and also because they believed in an international confederation of people and races, which was diametrically opposed to what the National Socialists believed in. And so when Hitler came to power, Esperantists were some of the first people who were rounded up and killed.
Other Nazis described Esperanto as "a danger to, in fact a mortal enemy of, all forms of völkisch development" and the movement as "led by Jews and their lackeys" or
[Esperanto] is bastard language, lacking roots in the life of the people and lacking any kind of literature arising from that life, is in fact acquiring that position in the world assigned to it by a Zionist plan aimed at exterminating patriotism among the future slave workers of Zion
In early April 1933 police invaded the headquarters of GLEA [the Communist, Workers’ Esperanto Association] in Berlin and confiscated all its property. AT the same time internal Gestapo papers called Esperanto "a secret communist language".
On 26 June 1935 Reinhard Heydrichdrew the attention of the Ministry of Internal Affairs to the fact that "recently the Esperanto movement has been engaged in very lively activity". As an example he mentioned that, among 36 people arrested in March 1935 in Düsseldorf for treason against the state, no less than 29 were Esperantists.
In November 1935 another internal Gestapo report (from Potsdam" stated that "it seems extraordinarily odd that inGermany the publication of journals in Esperanto, that deceitful Jewishlanguage, is still allowed, as is the case in Cologne".
If you have a reference at your fingertips about the Esperanto speakers, I'd be interested. If not, don't worry about it, not a big deal.
With regard to Hitler? The best is Lins's
Dangerous Language — Esperanto under Hitler and Stalin.
Two pieces of Esperanto trivia.
1. The famous (well not really) green star became the symbol of Esperanto because they featured on the covers of the first edition of the
Fundamento. This was because the printer had large stocks of the covers left over.
2. In
The Great Dictator the Ghettos feature signs in Esperanto