An organization whose members have a common cause for which they seek to influence public policy is cailed an

Interest Group or Lobby

Explanation:

An interest group is an organization whose members share common concerns and try to influence government policies affecting those concerns. Interest groups are also known as lobbies; lobbying is one of the ways in which interest groups shape legislation and bring the views of their constituents to the attention of decision-makers.

learning how to embrace the effects of colonialism is one of the central ideas of the play.

this quote could be referring to the death penalty. it's questioning the morality of sentencing murderers to death as a punishment, because it seems hypocritical. this quote seems to be arguing for non-lethal punishment for killers.