党同伐异的英文：
[Literal Meaning]
ally/same/attack/opponent
to ally partners and attack opponents

[解释]
结成帮派，偏向同伙，打击有不同意见的人

[Explanation]
to defend those who being to one's own faction and attack those who don't

[例子]
老史密斯在众议院党同伐异，对不同的意见根本不予理会。

[Example]
Old Smith defended those who being to his own faction and attack those who don't in the House of Representatives and ignored those different opinions.