DCHP-1 Online
mystery picket Esp. B.C. 
a person who, though not a union member, pickets in sympathy with union members forbidden to picket by injunction.
See also: citizen picket
- 1963 In its battle with the B.C. government, organized labor thought it had got around the law by using "mystery pickets."
- 1963 Mrs. Nan Bulbrook . . . told the Sun Friday she was hired as a mystery picket for the diamond drillers' union.
- 1965 About 130 painters and carpenters refused to cross a mystery picket line thrown up today at the Matsqui Institution for drug addicts.
- 1963 In its battle with the B.C. government, organized labor thought it had got around the law by using "mystery pickets."