Facebook has banned twelve far-right individuals and groups including former British National Party (BNP) leader Nick Griffin for violating the site's rules around promoting hate and violence.
Mr Griffin, from Llanerfyl, has been removed from both Facebook and Instagram along with the British National Party, the English Defence League and the National Front.
Facebook says its policy does not allow groups or individuals which engage in "terrorist activity, organised hate, mass or serial murder, human trafficking or organised violence or criminal activity".
Praise and support by others for any of the groups or individuals named by Facebook will also no longer be allowed on either social platform.
Britain First leaders Paul Golding and Jayda Fransen, English Defence League member Paul Ray, Knights Templar International's Jim Dowson and the National Front's Tony Martin have also been banned as part of the crackdown.
Facebook said it uses an extensive process to determine which people or groups it designates as dangerous, using signals such as whether they have used hate speech, and called for or directly carried out acts of violence against others based on factors such as race, ethnicity or national origin.
A spokeswoman for Facebook said: "Individuals and organisations who spread hate, or attack or call for the exclusion of others on the basis of who they are, have no place on Facebook,"
"Under our dangerous individuals and organisations policy, we ban those who proclaim a violent or hateful mission or are engaged in acts of hate or violence. The individuals and organisations we have banned today violate this policy, and they will no longer be allowed a presence on Facebook or Instagram.
"Posts and other content which expresses praise or support for these figures and groups will also be banned. Our work against organised hate is ongoing and we will continue to review individuals, organisations, pages, groups and content against our community standards."
Golding and Fransen's official pages were removed by Facebook last year for violating the site's community standards, but the new ban will prevent them from having any presence on Facebook or Instagram, including a personal profile.
In February, Facebook announced a permanent ban for far-right activist Tommy Robinson, real name Stephen Yaxley-Lennon, for behaving "in ways that violate our policies around organised hate".
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