Amazon warehouse workers are preparing to vote on whether to form the company’s first union.

Amazon is famously opposed to its employees unionizing. The company has gone to extreme measures, even hiring Pinkerton detectives to monitor efforts. The National Labor Relations Board (NLRB) accused Amazon of threatening, suspending and terminating employees for trying to organize.

It appears Amazon’s efforts have not been successful, however, as employees at the company’s warehouse in Bessemer, Alabama are moving forward with plans to vote on unionization. The NLRB has scheduled the vote for February 8 through March 29, and will involve approximately 6,000 employees.

It remains to be seen if the vote will pass. If it does, however, it would be a big step forward for unionization efforts within one of the biggest companies in the US.