In honor of the all-union Super Bowl, I present the All-Blue-Collar League, a collection of U.S. professional sports franchises named after local unions, industry.

In solidarity:

<tr>
    <th>MLB</th>
</tr>
<tr class="team astros" title="NASA’s Johnson Space Center and the greater space industry is a huge employer in the Houston region.">
    <td><span></span>Houston <b>Astros</b></td>
</tr>
<tr class="team brewers" title="Named for the city’s association with the beer brewing industry.">
    <td><span></span>Milwaukee <b>Brewers</b></td>
</tr>
<tr class="team mariners" title="The city’s location makes it a natural for many maritime industries, including fishmongering, and fishwivery.">
    <td><span></span>Seattle <b>Mariners</b></td>
</tr>
<tr class="team rangers" title="The Texas Rangers have been a statewide law enforcement agency since 1823, the oldest such agency in the U.S.">
    <td><span></span>Texas <b>Rangers</b></td>
</tr>

<tr>
    <th>NBA</th>
</tr>
<tr class="team pistons" title="Detroit is synonymous with the American auto industry, a source of high-quality middle-class jobs for most of the 20th century.">
    <td><span></span>Detroit <b>Pistons</b></td>
</tr>

<tr>
    <th>NHL</th>
</tr>
<tr class="team oilers" title="Edmonton is one of Canada’s major oil refinery centers.">
    <td><span></span>Edmonton <b>Oilers</b></td>
</tr>

NFL
Green Bay Packers
Pittsburgh Steelers
Dallas Cowboys

Thanks to @kostuch, @ikesmith, @joshandrews, @tcarmody, @lmsahistory, and @janieporche for suggestions.