The film has always been considered a metaphor for the 50's anxiety about Communist infiltration.

The military responded by firing into the crowds, alleging Communist infiltration.

As fear of Communist infiltration in the government grew, it became a central campaign issue in the 1946 elections.

The list was massively publicized in the federal government's effort against Communist infiltration.

At the time, there was widespread fear of Communist infiltration and subversion.

Communist infiltration of the police was clearly shown in the mutiny.

But the electronic barrier failed to stop either the bombing or Communist infiltration.

However, Congress, worried about possible Communist infiltration, closed the project in 1939.

The organization was structured in a unique fashion, ostensibly to defend against Communist infiltration.

The subcommittee was investigating Communist infiltration in the American media.