Colour bar and Ideological barrier

Colour bar noun - Barrier preventing blacks from participating in various activities with whites.

Ideological barrier and colour bar are semantically related. In some cases you can use "Ideological barrier" instead a noun phrase "Colour bar".

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

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