Here is a link to the union, their collective bargaining agreement, and the specific subsection. https://ucnet.universityofcalifornia.edu/labor/bargaining-unit

Here is a link to the union, their collective bargaining agreement, and the specific subsection. https://ucnet.universityofcalifornia.edu/labor/bargaining-units/bx/ https://ucnet.universityofcalifornia.edu/labor/bargaining-un... https://ucnet.universityofcalifornia.edu/labor/bargaining-units/bx/contract.html https://ucnet.universityofcalifornia.edu/labor/bargaining-un... https://ucnet.universityofcalifornia.edu/labor/bargaining-units/bx/docs/bx_2010-2013_19_no-strikes.pdf https://ucnet.universityofcalifornia.edu/labor/bargaining-un... So, it is a specific clause with its own sub-section in the contract that the union made. From what I understand on how collective bargaining agreements work in the US, this means that all UC grad students, including non-members, are bound by the terms of the agreement as the union represents the entire UC grad student unit (except UCSF) and thus is the sole, exclusive, legal representative of all individuals in the unit regardless of whether they are union members or not. As far as I know, there is no legal way for any individual in the unit to be bound by a different agreement (except maybe if the union and employer allows it?) as it is illegal for organizations to make agreements with individuals in the unit without union approval.