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This is what I use the populate the dropdown in my reassignment screen:

Get the participations like Michael suggested or through an hql query and then loop through the them to find the users:

    for (Participation participation : participations) {        if (participation.getUserId() != null) {            users.add(participation.getUserId());        }        else if (participation.getGroupId() != null) {            List groupUsers = noTxCmdService.execute(new FindUsersInGroupCmd(participation.getGroupId()));            if (groupUsers != null) {                for (User groupUser : groupUsers) {                    users.add(groupUser.getId());                }            }        }    }  

FindUsersInGroupCmd:

    public List execute(Environment environment) {        IdentitySession identitySession = environment.get(IdentitySession.class);        return identitySession.findUsersByGroup(groupId);    }

Hope  this helps

Walter