The authority of the new provisional government was soon challenged by the councils of representatives from the workers and

The authority of the new provisional government was soon challenged by the Soviets, councils of representatives from the workers and Soldiers. 
I think the answer to your problem are Soviets and Soldiers. I hoped this helped you solve the missing words.

Ifound this on google”the munich conference of 1938 was prompted by d. hitler's intention to take control of part of czechoslovakia. hitler sought to unite german-speaking people in a single nation and thus turned his sights on the sudetenland, a german-speaking region of czechoslovakia.” i hope it you