Form Ranks

Form Ranks is a Minutemen main quest in Fallout 4.

Detailed walkthrough
Initiated sometime after the side quest Inside Job. This side quest is only available after you build the teleporter during The Molecular Level main quest. Start the quest Institutionalized and use any terminal at the Institution and insert the network scanner holotape. Return to Sturges to give him the data you stole.

Objective: Talk to Preston Garvey about the Institute, more settlements are needed for the Commonwealth Minutemen.

This quest is available if you are kicked out of the Institute, have changed your loyalty etc. Once that happens, go and talk to Preston Garvey about the situation.

You will need to recruit and build more settlements for him to tackle the Institute. If they already have enough, he will speak about an attack on The Castle.