# William Sidney de Mattos

> British socialist activist

**Wikidata**: [Q21296884](https://www.wikidata.org/wiki/Q21296884)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/W._S._De_Mattos)  
**Source**: https://4ort.xyz/entity/william-sidney-de-mattos


## References

1. Source