Walmart launched a large-scale response this week to a series of unprecedented labor strikes, according to a confidential document…The seven-page internal memo…is intended for salaried employees only, and contains instructions on how to respond to strikes by hourly…Legal experts said the confidential memo shows an unprecedented level of caution from a company that has taken harsh stances towards employee attempts to organize in the past...The majority of the memo is aimed at instructing managers not to violate workers' legal right to engage in concerted activity, or non-union labor organizing…According to [Lance] Compa [labour law professor, Cornell University], the memo reflects Walmart's concern over the 20-some charges of unfair labor practices that Walmart workers filed with the National Labor Relations Board (NLRB)…in concurrence with the strikes.