In what ways do pressure groups and movements exert influence on politics?

Pressure groups and movements exert influence in a variety of ways:

a) They mostly carry out information campaigns, organizing meeting, filling petitions, etc. to gain the support of public

b) By organizing strikes and protest they seek to make the government take care of their demands

c) They also influence decisions making by lobbying

d) Sometimes political parties grow out of movements. So the pressure groups raise the issues and influence the various political parties