You prove you didn't read the link...……….Your link doesn’t say that. It says that management sent a memo to union leaders telling them what Shell would and would not tolerate.
https://www.msn.com/en-us/news/us/trumps-large-union-crowd-at-shell-was-given-the-option-of-not-showing-up-—-and-not-getting-paid/ar-AAFU6tl?ocid=spartandhp
Union leaders said____________________