Nov. 14 (UPI) -- The National Labor Relations Board has ruled it is illegal to force union-backing employees to attend meetings held by their companies that are designed to undermine support and argue against the labor groups. The NLRB called them mandatory "captive audience" meetings , and overturned the so-called Babcock rule, which the NLRB enacted in 1948 that allowed for companies to require employees to attend anti-organizing meetings. Advertisement The ruling stems from a case at Amazon '