'Subversive organization' means every corporation, society, association, camp, group, bund, political party, assembly, body or organization, composed of two or more persons, which directly or indirectly advocates, advises, teaches or practices the duty, necessity or propriety of controlling, conducting, seizing or overthrowing the government of the United States, of this State or of any political subdivision thereof by force or violence or other unlawful means
Seems quite broad, no? So many ways to define sets of people, and then say you only need 2. So basically any time you have any kind of relationship with another individual you are suspect.
two or more persons, which directly or indirectly advocates, advises, teaches or practices the duty, necessity or propriety of controlling, conducting, seizing or overthrowing [...] any political subdivision [of the U.S.] by force or violence or other unlawful means
A subset of which is
indirectly advocates [or] advises the propriety of controlling or seizing or overthrowing any political subdivision of the government of the United States by other unlawful means
So basically any citizen in any relationship with another citizen cannot be safe from worry should he mention what he honestly thinks of the established order and what should be done with it. And whatever he legitimately thinks should be done, if the establishment doesn't like it he's fucked because
is a criterion that could probably jail the U.S. population ten times over - and it looks like it'll keep getting worse.