1
general::
Phrase(s): the party line
Fig. the official ideas and attitudes that are adopted by the leaders of a particular group and that the other members are expected to accept. • Tom has left the club. He refused to follow the party line. • Many politicians agree with the party line without thinking.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
The official policy of an organization or government, as in The current party line opposes legalized abortion in all cases. This term, dating from about 1830, was originally used for a political party's official policy but in the mid-1900s was almost exclusively applied to the rigid dicta of the Soviet Communist Party. Since then it has returned to looser use.
American Heritage Idioms