Bertrand Russell knew all about the MAGA threat in 1959

Fascism is on the rise because they keep trying. See the letter in @Melizmatic’s comment where Russell refuses to debate Oswald Mosley, who was leader of the British Union of Fascists in the 1930s. That was in the 1960s.

Keeping the subject to the UK, Rock against Racism and the Anti-Nazi League were in the 1970s and 1980s, Anti-Fascist Action was in the 1990s. Antifa, despite claims to the contrary (I have even seen people here do it), started in the mid 2000s (I understand that it was around earlier in Germany)

The fight against fascism only exists because fascism exists, and never stopped existing.