What's the Kennection? #303

In what 2015 movie did Liverpool's onetime cruiserweight boxing champ Tony Bellew play "Pretty" Ricky Conlan?

What "Bleeding Kansas" city was the site of Quantrill's raid in 1863?

What was the last name of advice columnist "Dear Abby," the pseudonym of writer Pauline Phillips?

In his Leviathan, philosopher Thomas Hobbes memorably wrote that the life of man was "nasty, brutish, and" what other adjective?

What BBC TV series stars Idris Elba as the title police detective, inspired by both Sherlock Holmes and Columbo?

What's the "Kennection"?