Research: Lobbying

This is an 8-minute video that explains the basic ways lobbyists and interest groups affect laws in the US.
https://www.youtube.com/watch?v=bOvBA7oIIgc

This public-service group tries to keep track of how much lobbying groups are affecting givernment. As you narrow down the lobbying groups you want to research, you can find more detailed records here.
https://www.opensecrets.org/influence/

This is a long but very useful article from 2007 that has great history. It's available on the Opposing Viewpoints database. You may have to sign in to the library.
Silverstein, Ken. "Their men in Washington: undercover with D.C.'s lobbyists for hire." Harper's Magazine, July 2007, p. 53+. Opposing Viewpoints in Context, http://link.galegroup.com/apps/doc/A166002108/OVIC?u=pcc&sid=OVIC&xid=c21e20a4. Accessed 20 Feb. 2019.

CQ Researcher has a full report on this issue.
McCutcheon, Chuck. "Regulating Lobbying." CQ Researcher, 6 June 2014, pp. 481-504, library.cqpress.com/cqresearcher/cqresrre2014060600.

Wikipedia is also a good source for basic facts.
https://en.wikipedia.org/wiki/Lobbying_in_the_United_States

Look up this article on Ebscohost or read it at the magazine's website:
https://www.thenation.com/article/shadow-lobbying-complex/

Look up this article on Ebscohost to understand the NRA specifically:
RESTON, LAURA. 2017. “The NRA’s New Scare Tactics.” New Republic 248 (11): 6.