[5] Involved in Baltic nationalist propaganda,[6] he founded the clandestine newspaper Der Baltische Föderalist in Switzerland in 1883, whose success reportedly led to a deportation to Siberia.

During his time in Madrid, he supported, along his friend Isidoro López Lapuya [es], Jewish immigrants coming from Russia.

[10] A noted polemicist vis-à-vis his political activity, espousing republican-socialist ideas, Bark held feuds with Pablo Iglesias Posse and Juan Montseny Carret (Federico Urales).

[5] A close acquaintance of Alejandro Sawa,[11] the character Basilio Soulinake in Ramón María del Valle-Inclán's Luces de bohemia is based on Bark.

[14] He actually died in his home in Madrid located at Calle de Ayala 57 on 24 October 1922,[15] as it is reported in several obituaries published in newspapers such as La Libertad[13] or El Liberal.