Collocations for supporter - noun

active, ardent, avid, big, close, committed, diehard, enthusiastic, fanatical, fervent, great, keen (esp. BrE), loyal, passionate, stalwart (esp. BrE), staunch, strong
an active supporter of democratic change
The emperor was deserted by his closest supporters before the end of the war.
diehard supporters of the old system
Only stalwart supporters of the team stayed to the end. (BrE)

outspoken, vocal
core, leading, principal, prominent
lifelong, long-time
traditional
an area of traditional Republican supporters

government, opposition, party, political
Conservative, Democratic, Labour, Republican, etc.
grass-roots
The party has not been listening to the concerns of its grass-roots supporters.

football, rugby (both BrE)
gay rights, human rights, war, etc.

army, band, crowd, group, legion, set (BrE)
Both sets of supporters applauded the fantastic goal.

have
attract, mobilize, rally
to attract supporters to the cause

alienate
urge
The party is urging supporters to keep up the pressure on the government.

cheer
a crowd of cheering supporters