Act 10 voided the TAA’s contract with UW-Madison in 2011.You can view text of the 2009 contract here. However, UW’s policy states that the TAA contract governs the employment relationship between graduate workers and the university until a new employment policy is developed:

Although this agreement is no longer in force, the university is continuing to use the terms of the contract until final university policies are adopted.

If you suspect that your rights under the contract have been violated, contact the Contract Enforcement Committee.