Truth of the matter is that unions are no longer necessary in this country because employees are very well protected by numerous laws enforced by the labor boards, OSHA, EEO, and others.
Unions were never necessary in the first place. The history of unionism parallels that of statism and Communism as evidenced by the Wobblies (IWW) among numerous others. Many of the early unions were founded by foreigners, often with Russian roots, intent upon overthrowing America.
In line with the original post in this thread, the entire premise of unions is built upon an evil foundation. Unionism is in direct opposition to individual freedom and liberty. In short, "biting that hand that feeds you" is at the heart of the labor union modus operandi.