This could be classified as a typical means of moral suasion, which can be seen as benevolent compulsion, or making others conform without enforcing rules directly.
Some other means are: discount window lending (as lender of last resort); moral suasion (cajoling the behavior of certain market players); and open mouth operations (publicly asserting future monetary policy).
To effect this change, members practiced a policy of moral suasion, an appeal to people's ethics in an attempt to get them to embrace abolitionism and renounce slavery as sinful.
