This is the 18227th most frequent Russian word.
чехословацкого
"Of Czechoslovak" or "Czechoslovak."
Here, the word "чехословацкого" is used as part of a phrase denoting the origin (Czechoslovak) of the movement.
Я читаю книгу о чехословацкого движения свободы.
I am reading a book about the Czechoslovak freedom movement.
In this usage, "чехословацкого" describes the national association of the dissident.
Этот фильм рассказывает историю чехословацкого диссидента.
This movie tells the story of a Czechoslovak dissident.
Here, "чехословацкого" refers to the geographical or production origin of the chocolate.