I've been building a large site called Union Songs for over 10 years now.
The front page says
Call them rebel songs, slave songs, songs of freedom, work songs, songs of dissent, songs of struggle, protest songs, liberation songs, labour songs, labor songs, workers songs, environmental songs, songs of equlity, peace songs.
For over two centuries working people across the world have built trade unions. This site documents the songs and poems that they made in the process, union songs. It includes songs and poems that are being written today, as the process of union building continues all around the world.
and the collection now contains over 600 songs and poems from more than 240 authors and I'm adding new and old songs all the time.