Special groups represent a membership with a common interest, but cannot nominate candidates.

Interest

Explanation:

Special interest group(SIG) is the committee of people which is made on the basis of common interest and knowledge of people in the political field.They can impact the public policy by spreading knowledge and facts among the public on public matter and issues.

This committee of people work under government framework but are not allowed to nominate or run candidates in elections.They organize conference meeting for educating people and resolving issues.

hello,

answer: a federal government has final authority on interstate/inter provincial  and international affairs, a confederation is one where the central/national government or authority is governing body what does not have final say over the same matters. hopefully this and i will try again if you don't like this answer : )

best of luck!