They are prominent in 19th and early 20th century Spanish history, but I did not think they were still a vital political force, once Franco had stepped down and Juan Carlos became king. Perhaps their website does not give any sort of impression of their current state. But I was thinking of them briefly today, but for no particular reason.
A previous post on the Carlists.
There is this group on Facebook: Juventudes Tradicionalistas de España - JTE.
The Former Royal House of Spain (Carlist), 1939-1945
Carlism's Defense of the Church in Spain, 1833-1936, by Alexandra Wilhelmsen
CARLISM & CARLOS-HUGO de BORBÓN-PARMA, now DUKE OF PARMA
The Mad Monarchist: Controversy, Carlism and Juan Carlos