Why do employees join labor unions?

must have at least 1 reference per discussion
1:
Think about how human resources are handled at the company you work for, or one you have worked for in the past. In the discussion thread, comment on the following questions:

What steps of the human resources cycle does the company handle well? Why?
What steps of the human resources cycle are handled poorly? Why?
How is culture impacted by the Human Resources department?

2:
“Employee labor unions”

Why do employees join labor unions? Did you ever belong to a labor union? If you did, do you think union membership benefited you? If you did not, do you think a union would have benefited you? Why or why not?