Val has the bases covered, just to add my personal experiences:
I knew a lot of younger dubs that went inactive, and nothing was ever done to them. For the most part, they just stayed away from the Hall, and we never saw them again. On the rare occasion that they did attend a meeting (usually the Memorial) they were welcomed by most all of us.
It was a different story for older ones who tried to leave, especially if they were brothers who'd been servants and/or had lots of JW family. There was a general compulsion by the elders to make "examples" of such ones. Frequently the families themselves made as much or more of an issue about it than the elders, but in response the elders had to "do their duty." Knowing this, not too many older ones tried to leave, they just "grinned and bore it."
1975 changed things alot. The post-1975 WTS anti-apostate campaigns really aggravated things, and that was when I first remember seeing the witch-hunts. Ray Franz's departure in 1980 was like pouring gasoline on a fire. From then on, even a scent of apostate thinking was aggressively pursued, and for the most part the elders, who were supposed to be "shepherds of the flock," turned into full-time WTS enforcers. Deliberate inactivity was no longer viewed as a simple act of quiet departure; it was peremptorily assumed to indicate apostate thinking, guilty until proven innocent. Many therefore tried to dodge being df'd by da'ing themselves, but then WTS closed that loophole by classifying da'd ones the same as df'd.
With minor variations, that was the tone I saw until I too decided to fade in the late '90's. After about a year, the elders came after me and said my inactivity indicated apostasy, and they would have to df me unless I reassociated. We negotiated that my attending 10 consecutive meetings would show that I was not apostate. After the 10th meeting, they then came after me and said since I was now reactivated, I would have to prove to them that I didn't still secretly harbor any apostate opinions! (Did I walk into that trap, or what??). After almost 2 years and 6 committee meetings, they finally df'd me.
Recent WT articles about apostasy, as well as the August KM insert about treatment of df'd ones, reminds me of the early '80s when I first saw the big shift. I expect that things will only get worse from here; the Panzers are rolling again.
Craig