This is the 8909th most frequent Russian word.
профсоюза
"Профсоюза" means "trade union" or "labor union" in English.
Here, 'профсоюза' is the possessive structure, highlighting that the meeting is organized by the labor union.
Собрание профсоюза состоится в пятницу вечером.
The labor union meeting will take place on Friday evening.
In this sentence, 'профсоюза' identifies the members as part of the organized labor union.
Члены профсоюза обсудили план действий на ближайший год.
The members of the labor union discussed the action plan for the upcoming year.
The word 'профсоюзе' refers to a labor union, an organized association aimed at representing workers.