Thursday, 250 Teamsters in Seattle went on strike against Republic Services, the second-largest waste disposal company in the United States. Workers in Buffalo, New York, and Columbus, Ohio struck Republic for three days earlier this week. These workers aren’t responding to moves by local management. Instead, they went on strike in solidarity with 24 striking co-workers in Alabama. That kind of strike has become all too rare in the modern labor movement – and it’s usually illegal.