Yes, The Paper, Allied-Industrial, Chemical and Energy Workers (PACE)(which include service workers) and the United Steel Workers of America (USWA), recently merged. The new union of unions is known as the United Steel Workers (USW). I believed they dropped the "of America" part because the PACE union represented workers in Canada.
I'm trying to come up with more funny sayings for the union acroynms... USW... hmmm...