#2. The Union never worked out for WWE (then WWF)
With The Corporate Ministry faction taking charge of things in WWE, the babyface group of Mankind, The Big Show, Ken Shamrock, and Test formed The Union.
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The group was formed in order to go toe-to-toe against The Corporation, who had already established their places as some of the best heels of the Attitude Era. The members of the group united, as they felt that they were mistreated by The Corporation, under the rules of Shane McMahon.
Occasionally, the likes of Vince McMahon, Shawn Michaels, The Rock, and Stone Cold Steve Austin also helped The Union in fighting off a common enemy. However, the babyface group never took off, and with Vince McMahon revealing himself as "The Higher Power", WWE quietly decided to bring an end to The Union.
The group was disbanded after avoiding the spotlight for a while. With Mick Foley also needing surgery in real life, the Union of People You Outta Respect, Son was disbanded within a month.