Interest groups work to do all of the following,

a) nominate candidates for office
b) participate in lobbying
c) influence government to adopt certain policies
d) build relationships with lawmakers to sway their decisions

Do you mean israel ?

Primary sources are usually  more accurate and are written by someone who experienced it or witnessed it. secondary sources are those who heard of it after the fact that can lose details and or twist the event in a light that benefits them.