I'm not sure who exactly Lansky is without more information. He could be a historical figure, a criminal perhaps, or someone with an interesting life story that has been turned into this piece of work.
It is. The movie 'Lansky' takes inspiration from the actual events and experiences of Meyer Lansky, although it might have some fictionalized aspects for dramatic effect.
Well, to a large extent it is. The movie takes cues from the real-life story of Lansky but might have some fictional elements added for dramatic effect.