The company has campaigned aggressively against the union, including a crescendo of text messages sent directly to workers, according to one pro-union site. It has also reportedly deleted hundreds of thousands of lower-level warehouse workers from a corporate directory…

Executives have replied to political attacks with pugnacious tweets, directly targeting Elizabeth Warren and Bernie Sanders in comments last week amid criticisms that the company doesn’t pay enough taxes or adequately compensate employees.

“I welcome @SenSanders to Birmingham and appreciate his push for a progressive workplace. I often say we are the Bernie Sanders of employers, but that’s not quite right because we actually deliver a progressive workplace,” Amazon consumer boss Dave Clark tweeted on Wednesday.

More broadly, Amazon has challenged the narrative that it is a harsh place to work. In a tweet to Rep. Mark Pocan (D-Wis.), the company denied allegations that tough schedules force workers to urinate in bottles rather than take bathroom breaks — prompting more reports that this is indeed taking place.