Edit in JSFiddle

var $items = $( "li" );

$items.find( ".team" ).fadeOut( "slow" );

<ul>
    <li class="team">Darcy Clarke</li>
    <li class="team">Chris Coyier</li>
    <li class="team">Corey Frang</li>
    <li class="board">Scott González</li>
    <li class="board">Dan Heberden</li>
    <li class="board">Paul Irish</li>
    <li class="board">Scott Jehl</li>
    <li class="board">Yehuda Katz</li>
    <li class="board">Dave Methvin</li>
    <li class="board">Doug Neiner</li>
    <li class="team">Addy Osmani</li>
    <li class="board">Todd Parker</li>
    <li class="board">John Resig</li>
    <li class="team">Alex Sexton</li>
    <li class="team">Jonathan Sharp</li>
    <li class="board">Leah Silber</li>
    <li class="board">Adam Sontag</li>
    <li class="team">Karl Swedberg</li>
    <li class="team">Rick Waldron</li>
    <li class="board">Ralph Whitbeck</li>
    <li class="board">Richard D. Worth</li>
    <li class="board">Jörn Zaefferer</li>
</ul>