Query Custom Post by Category

Are these custom taxonomies or the regular categories?

if they are just categories you should use:

$args = array(
  'posts_per_page' => -1,
  'post_type' => 'news',
  'orderby' => 'date',
  'order' => 'DESC',
  'category_name' => 'Alumni'
);
$loop = new WP_Query( $args );

<?php while ( $loop->have_posts() ) : $loop->the_post();?>
...
<?php endwhile; ?>

if you want to use it by id

use:

'cat' => 160 

instead of

'category_name' => 'Alumni'