HOUSTON, (Reuters) – The labor union that represents workers who are locked out of a Exxon Mobil On Friday, Corp (NYSE:), a refinery in Texas accused Oil Corporation of “busting our union” through its support for efforts to dissolve the union.

Exxon evicted 650 workers unionized at its Beaumont plant in Texas on May 1, after the previous contract had expired. There was also no vote regarding the proposed offer. This refinery makes gasoline and Mobil 1 oil. It has been able to keep running with managers and temporary staff.

This week, the U.S. National Labor Relations Board announced that it received a petition signed by at least 30 percent of United Steelworkers local 13-243 workers. That is the minimum requirement to request a decertification voting to disband the union.

Beaumont employees could approve decertification to remove the USW from their role as bargaining agent. A timetable for when the vote might occur is not yet established.

In a Friday statement, the USW stated that any vote will be affected by “serious unfair labor practices”. It also accused Exxon “misleading people” with misleading statements about our union, negotiations, and their spiteful lockout …”

USW stated that the proposed proposal would remove important worker seniority protections. Additionally, separate contracts were created to protect the employees of the plant’s refinery.

Exxon stated that the proposal it submitted had provisions necessary to enable flexibility for business in low-margin areas. This week Exxon intensified its effort to win a referendum. The union was accused of planting misinformation, and participating in voter suppression during the decertification efforts.