allied political party; friendly party
Used in political contexts to refer to a party that is allied with or friendly to one's own party. Not a general term for any friendly group.
The ruling party formed a coalition government with an allied party.
For electoral cooperation, they coordinated candidates with a friendly party.
Compound of 友 (friend, ally) and 党 (party). The reading ゆうとう is the standard on'yomi combination.