We are a membership district, and yes, our firefighters have refused to go out if you didn't way the dues.  We now go out, but charge $500 if you aren't a member. I was the secretary for many years and I always got the $500, but it wasn't easy.  Asshats never wanted to pay, so I just filed in small claims court for the dept.  I retired undefeated several years ago, always got my money.

 No sympathy for these people.  Some one has to pay.  Either pay your dues or watch it burn.