My `for` loop has fallen...and it can't get up
First: grab all entries that match your criteria

Second: grab all Tags related to your entries

PHP

$entryIds = Entry::find()
    -&gt;yourTagField(':notempty:')
    -&gt;fellowStatus('1')
    -&gt;section('fellows')
    -&gt;ids();
$tagsRelatedToEntries = Tag::find()
    -&gt;relatedTo($entryIds)
    -&gt;all();


Twig

{% set entryIds = craft.entries
    .section('fellows')
    .fellowStatus('1')
    .yourTagField(':notempty:')
    .ids() 
%}
{% set tags = craft.tags.relatedTo(entryIds).all() %}