Yagy, There are 4 people I would contact if you feel that you are being "Singled Out".
1. Your Steward
2. Your Division Manager
3. The District Labor Manager
4. The District Employee Relations Manager
These 4 people can be very powerful people within your district. Your Division Manager will not want to field questions from your Labor Manager, and especially the ERM.
The Labor Manager is always looking to reduce grievances and doesn't want work that should be handled by the Division Manager.
The ERM is an extremely powerful position, especially when there are potential workers rights violations. When you call the ERM, the MUST investigate
Good Luck