When those poor Synths are at their most vulnerable, afraid of the Institute and the world above, the Railroad persuades them that mem-wiping might be a great idea. Glory is, I think, the only Synth they saved who is not mem-wiped. A strange action, as mem-wiping is not that different from getting murdered and having your body donated to another person. At least the Institute does not give your body to someone else when they mem-wipe you.
It is so common that it creeps me out. Makes me wonder if Amelia is just a Synth into whom Stockholm put his real daughter's memories. Just imagine it... "Railroad Inc., buy your loved one from the dead!" Well, Des and her group are honestly trying to save the Synths, but sometimes I do wonder if there is not something darker hiding inside this secretive organization...