From Billboard, 1978:

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DANKO STRIKES -- When Japanese employees want to express their unhappiness they wear headbands that say, "danko," which literally means "to go on strike." Arista's Rick Danko, second from left, during his recent Japanese tour visits Toshiba-EMI, Arista's licensee, where head and arm bands, which coincidentally spell his name, were worn in his honor.