I think the ranking of gangster TV series is as follows:

No 1。 Sopranos: the originator of modern gangster drama.

No2。 Firewire: a TV series with the theme of crime.

Third. A gangster TV series.

Fourth place. Bloody gangster: the story of the gangster family.

Fifth place. Bad guy: a crime TV series.

Sixth place. Classics in Hong Kong gangster movies.

Seventh place. Spartacus: a historical TV series.

Eighth place. Bad guys must die: China crime movies.

Ninth place. Chicago police: Chicago gangster TV series.

No. 10. Sparrow: spy war TV series.