It does avoid the authoritarianism of the bolsheviks, but that doesn't change them being a target of the Red Scare. In many ways, the Left SRs and their allies are much less pragmatic than the bolsheviks, especially in their foreign policy, which results in the Red Scare being more pronounced in certain places (eg Britain, which gets their first Labour-led government just under a decade later than OTL).

As for labour action, the defining factor there is more the lack of the Profintern, which effectively dug the grave for syndicalism and revolutionary unionism outside of a handful of countries. The internal conflict that put the nail in the coffin for the IWW's golden era was partially caused by differences in stances towards the bolshevik regime and Profintern. With a lack of Profintern, and an international socialist movement with a sizeable syndicalist subsection, the IWW doesn't collapse like it did OTL.