Other types of loansharking

Aside from the knockdown and the vigorish, are there any other types of loansharking out there employed by the Mafia?

Loansharks will lend money to other loansharks at 1% interest per week and those other loansharks will push it out on the street at 2%-3%.

Correct.

Part of the Westies-Gambino alliance perks for the Westies was that the Gambinos would give the Westies $ to run a shy at 1% vig, which is the % rate the family would give their own soldiers.