It is taken into effect to become law... but if the law doesn't work out, the judicial branch can uphold it in court and lawyers will defend the law if they think it's needed but the winning argument is the one that decides what happens next. If the law get's 'thrown out,' then the lawyer can go to the supreme court if they want to try it again with a higher power court.
Hope this helps! Let me know if you have any questions.
Answer:
The Siege of Leningrad is a event which took place during WWII. This was a was a prolonged military blockade undertaken from the south by the Army Group North of Nazi Germany against the Soviet city of Leningrad on the Eastern Front in World War II.