Color line and Ideological barrier

Color line noun - Barrier preventing blacks from participating in various activities with whites.

Ideological barrier and color line are semantically related. In some cases you can use "Ideological barrier" instead a noun phrase "Color line".

Ideological barrier noun - A barrier to cooperation or interaction resulting from conflicting ideologies.

Color line and ideological barrier are semantically related. Sometimes you can replace phrase "Color line" with "Ideological barrier", this phrases are similar.