What's the plural form of hoodlumism? Here's the word you're looking for.
Answer
The noun hoodlumism can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be hoodlumism.
However, in more specific contexts, the plural form can also be hoodlumisms e.g. in reference to various types of hoodlumisms
or a collection of hoodlumisms.