This is an example of why the need for labor union's exist

  Wal-Mart raises healthcare costs, cuts benefits for some part-timers

"... Wal-Mart Stores Inc, the biggest U.S. private sector employer, said on Tuesday that its 1.3 million workers would have to pay more for healthcare and it would end benefits for some part-time staff in a move that could prompt other companies to follow suit...."

Reference: www.reuters.com