To the Mattresses {1-6} The Railroad Quest
To get this quest, talk to Desdemona in the Railroad HQ after you destroy The Institute. It's a series of 6 quests.
This quest will be triggered or can be aquired when you complete The Nuclear Option quest.
Related points of interest
Stages of "To the Mattresses {1-6}" quest
1. Kill {name of L&L Leader}
The Synth-hating L&L Gang is the greatest single threat remaining to the Railroad with the Institute out of the picture. Desdemona has a lead on them. And my job is dealing with it.
Possible locations: Poseidon Energy, etc.
Names of L&L Leaders: Lucky Tatum, Big Maude, Stevie Buchanan, Tammy Mac, The Bruiser and Captain Sally.
2. Return to Desdemona
The L&L Gang is a little smaller thanks to me. Desdemona will want to hear the good news.
or when you killed the last leader ...
With the fall of Captain Sally, the L&L Gang has finally been put down. Everyone back at HQ, especially Desdemona, will want to hear this.
3. Quest completed
Despite my work, The L&L Gang is still out there and potentially putting our people and Synths at risk. Hopefully Desdemona will have more intel on them soon.
or ...
Raiders will be a problems for Synths and humans alike, but the Synth hating L&L Gang won't be plaguing us any longer.