The ruling party
An opposition party
A splinter party
Political dissidence
A political dissenter
A cleavage
A split or a rift
A manifesto
A platform
Ideology
An ideologist
Financing
A slush fund
The party members
Party membership
The leadership
A party leader
A party official
A reformist
To reform
The rank-and-file
Activism
An activist
A party cell
A party congress/conference
To found a party
To finance
To join a party
To claim a membership of
To handout pamphlets or tracts