German to English Social Sciences History

From a letter, written in 1945 in Budapest, by a non-native German speaker:

"In Ungarn ist die Valorisation gut gelungen, wenn auch einige Symtomen sind, die verdächtig waren, wir hoffen das die Regierung genug stark sein wird jede Mienenarbeit der Reaktion um unser Geld wertlos zu machen unmöglich macht."

My proposed translation: "In Hungary, valorization has been quite successful, even if there are some indications that were suspicious. We hope that the government will be strong enough to render every [undermining effort???????] of the reactionaries to make our money worthless impossible."

I don't know if "Minenarbeit" refers to terrorist activity of some sort or just "undermining efforts" of the reactionary forces in Hungary at that time.