This is 100% not my area of study...BUT! I found a reading list for a PhD exam (Word doc) in “global labor history” that should have the major works on it, as well as some important/groundbreaking more recent stuff.

If the Word link doesn’t work, you can download it from this page, under the “Thematic History section below all the geographies.

I hope this helps! What a cool subject!

Besides the wonderful list provided by /u/sunagainstgold, I would add a few names from another direction:

Anything by the late, great Archie Green (1917-2009) because it is always good to listen to the stories of labor: a folklorist, he coined the term "laborlore" and he deserves a look.

Much the same can be said for "Studs" Terkel (1912-2008), although unlike with Green, I never met him. He was a lot of things, but he wasn't a folklorist, not that it matters (not everyone is!). His book "Working" (1974) is seminal, and it represents something akin to Archie Green, except that Green focused on the stories while Terkel simple allowed people to speak. That said, when workers speak, they often speak with story.

And then one more thing because I find it irresistible: George Orwell, The Road to Wigan Pier (1937), about miners in York. Orwell is a fantastic writer, and his brief portrait of life as a miner in the 1930s is poetry.

I would pass along the immortal words of Abigail Adams who said, "don't forget the ladies." A classic in my field that relates to your topic is Blackboard Unions by Marjorie Murphy. It's a really interesting look at how labor activism in women dominated fields looked different and often focused on different things than activism by men.

You should start with THE canonical text: E.P Thompson’s The Making of the English Working Class. Here’s a good synopsis

I can give LOTS of reccomendations for British labour history, but judging by you spelling (labor) I assume you're American and it wouldn't help?