How is that any different from a union taking stands that you don't agree with? If I have a right of free speech and you have a right of free speech, how is it

How is that any different from a union taking stands that you don't agree with? If I have a right of free speech and you have a right of free speech, how is it that together we don't have a right of free speech? In other words, I'm not referring to the "corporation as person" doctrine but the "corporation as voluntary association of people" reality.