Why do unions emphasize the need for cohesiveness?

So they can issue calls for "solidarity" to members during periods of threat

Because group members tend to behave differently.

Because age, seniority, and other background characteristics are probably quite similar.

Because members of the group are likely to hold the same basic values.

With the exception of worker compensation laws, which were passed during the early 20th century, virtually all other employment regulation followed the passage of the

Permissive Actions Act.

Unionization Freedom Act.

Employment and Wages Act.

Wagner Act.