Wal-Mart has famously, perhaps infamously opposed union organization in its stores. They have survived the very few union elections that have been held. But, they may not survive the latest effort to improve working conditions at Wal-Mart stores. Organization United for Respect at Wal-Mart (OUR Wal-Mart) does not seek to form a union, but does seek to improve working conditions. See Workplace Prof report. The group claims to have thousands of members and will soon have a web site and Facebook page. They seek to improve the low pay, benefits and simply to gain more respect.
The group receives some union financial support and in the end, may be a better fit for Wal-Mart workers.