Oh yes, they used to announce the reason:
w54 10/1 p. 595 par. 17 Christians Live the Truth
If announcements are made to congregations concerning someone who refuses to pay debts or who is going around taking money or other things from individuals in the congregation, the congregation servant should be the one to make the announcement and he should be careful to avoid wording something in a slanderous way but merely report the facts as they exist or that a person has been disfellowshiped for dishonesty or fraud. Then those who are in the congregation can be aware of what is going on and will be able to protect their own interests and the interests of their brothers. "His wickedness shall be openly showed before the assembly."
So the above article suggests that even after someone had been DF'd they were still able to continue interactions with the congregation.