Newtonian momentum is not conserved in Special Relativity. That is, momentum is conserved, but momentum is redefined - it's not just mass times velocity any longer. The new definition is more correct than the previous one.
Had this worked, it probably wouldn't have overturned conservation of momentum either. It might have redefined momentum again, though.
Had this worked, it probably wouldn't have overturned conservation of momentum either. It might have redefined momentum again, though.