党同伐异

1.defend those who belong to one's own faction and attack those who don't; be narrowly partisan; close ranks against aliens; discriminate against people who disagree with oneself; get rid of those with dissenting opinions; side with one's copartners against those who disagree; support one's own party and attack the others; take sides with those in the same cabal and ostracize those who hold different opinions; unite only with those of the same ideas and attack those who differ

1.无原则地分立门户派别,偏袒同党,攻击异己