This is the 15957th most frequent Russian word.
профсоюзными
"Relating to trade unions."
Here, 'профсоюзными' is used to describe the meetings related to trade unions, indicating an instrumental case in Russian for the adjective 'профсоюзный'.
Я участвовал в профсоюзными встречами работников.
I participated in union meetings of workers.
In this sentence, 'профсоюзными' modifies 'вопросами,' showing involvement with matters stemming from or relating to trade unions, utilizing the instrumental case to describe such questions.
Андрей занимается профсоюзными вопросами на работе.
Andrey is dealing with union-related issues at work.
Here, 'профсоюзными' provides context to 'движениями,' specifying that the movements described are those of trade unions, again in instrumental case to describe association or relation.