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Internationalism is a historically mainstream strain of Scoialism. Most socialists today who are active in socialist parties are internationalists.
In Socialism it's the belief that international solidarity between working classes is desirable and necessary to smash global capitalism. For grassroots movements like the Wobblies it's never worked, and not been part of any real success they've had. In statists movements, internationalism has manifested as Commie imperialism. Think the USSR taking over Ukraine and Eastern Europe.
If you want an example of ethnic/nationalist socialism that isn't the NSDAP, look to Yugoslavia. It was successful, and was based on a pan-nationalist nationalism of a large ethnic group: the southern slavs. It was made of a patchwork of ethnic groups who had their own states. They had a family of languages and South Slav blood in common. This is what bound them together as a Socialist nation.
Worked out for 40 years, too.