The power of defendants in some state [wex:civil] suits to move the case to federal court.  Generally, if the case could have been brought in federal court (ie there is [wex:federal question jurisdiction] or [wex:diversity jurisdiction]) a defendant may demand that the case be moved, or "removed," to federal court.  28 USC 1441.  

There are a few areas where, despite fitting in the above general rule, removal is not allowed.  See 28 USC 1441(b), 28 USC 1445.  In addition there are a few areas of law where removal is allowed even if the above condition is not met.  See 28 USC 1442, 28 USC 1443