Historical records suggest that the political extremes—at both the “left” and the “right”—substantially endorsed conspiracy beliefs about other-minded groups. The present contribution empirically tests whether extreme political ideologies, at either side of the political spectrum, are positively associated with an increased tendency to believe in conspiracy theories. Four studies conducted in the United States and the Netherlands revealed a quadratic relationship between strength of political ideology and conspiracy beliefs about various political issues. Moreover, participants’ belief in simple political solutions to societal problems mediated conspiracy beliefs among both left- and right-wing extremists. Finally, the effects described here were not attributable to general attitude extremity. Our conclusion is that political extremism and conspiracy beliefs are strongly associated due to a highly structured thinking style that is aimed at making sense of societal events.

Over the last three decades many Western European social democratic parties have been challenged by populist radical right parties. The growth and success of parties on the right flank of the party system represents a triple challenge to the social democrats: they increase the salience of issues traditionally ‘owned’ by the right; they appeal to working‐class voters who traditionally support the centre left; and they may facilitate the formation of centre‐right governments. This article explores social democratic parties' strategic options in the face of this challenge, and tests the widespread assumption that the centre‐left parties respond by taking a tougher stance on issues related to immigration and integration. Comparative analysis of developments in Austria, Denmark, the Netherlands and Norway reveals significant variation in the substance, scope and pace of the strategic responses of their social democratic parties. And it suggests that those responses are influenced not only by the far right but also by the reactions of mainstream centre‐right parties and by parties on their left (and liberal) flank. Internal disunity, potential or actual, is also an important factor.

In the wake of major events, whether these be terrorist attacks 1 , global pandemics such as the coronavirus disease 2019 (COVID-19) outbreak 2,3 or presidential elections 4 , conspiracy theories predictably surge across the Internet. Conspiracy theories, defined as beliefs that a group of actors are colluding in secret to reach a malevolent goal 5,6 , are common across times, cultures and populations 7,8 . Accumulating research has revealed that a reliable predictor of belief in one conspiracy theory is belief in another conspiracy theory 1,[9][10][11] . It therefore appears that people differ in their predisposition to explain events as conspiracies, which is sometimes referred to as 'conspiracy mentality' or the 'conspiracy mindset' [12][13][14] . The conspiracy mindset is closely associated with belief in a wide range of existing specific conspiracy theories, as well as the endorsement of conspiracy theories created by researchers for experimental purposes 15 . It differs from concrete conspiracy beliefs in that it taps into the general propensity to suspect that conspiracies are at play, uncontaminated by concrete events, actors or contexts.The political realm in particular is one key area where conspiracy beliefs are salient and thriving 16 . For instance, conspiracy theories are intrinsically connected to the rhetoric of populist political leaders who arguably exploit conspiracy theories for strategic reasons 17,18 . Importantly, citizens' belief in conspiracy theories predicts voting behaviour and intentions 19,20 and non-normative political action 21,22 . Traditionally, conspiracy beliefs have been associated with authoritarian worldviews 23,24 , as exemplified by positive relations between conspiracy beliefs and right-wing authoritarianism [25][26][27] . Stripping a politically right-wing stance from the surplus meaning of authoritarianism (and its strong connection to traditions and authorities), many studies have found a linear relationship between self-reported political orientation and conspiracy endorsement 16,28,29 , suggesting that conspiracy beliefs are more common at the political right than at the political left [30][31][32][33] .However, in contrast to this simple, linear relation, numerous findings point to a curvilinear relation between political orientation

Changing collective behaviour and supporting non-pharmaceutical interventions is an important component in mitigating virus transmission during a pandemic. In a large international collaboration (Study 1, N = 49,968 across 67 countries), we investigated self-reported factors associated with public health behaviours (e.g., spatial distancing and stricter hygiene) and endorsed public policy interventions (e.g., closing bars and restaurants) during the early stage of the COVID-19 pandemic (April-May 2020). Respondents who reported identifying more strongly with their nation consistently reported greater engagement in public health behaviours and support for public health policies. Results were similar for representative and non-representative national samples. Study 2 (N = 42 countries) conceptually replicated the central finding using aggregate indices of national identity (obtained using the World Values Survey) and a measure of actual behaviour change during the pandemic (obtained from Google mobility reports). Higher levels of national identification prior to the pandemic predicted lower mobility during the early stage of the pandemic (r = −0.40). We discuss the potential implications of links between national identity, leadership, and public health for managing COVID-19 and future pandemics.

A large volume of academic research has demonstrated that individuals who profess radical political ideology, both left-and right-wing, tend to share similar underlying psychological patterns. By utilizing data collected through a voting advice application in Sweden, this study aims to assess whether extreme leftists and rightists share similarities in the psychological and political understanding of how society functions. We propose three hypotheses to test this pattern: Extreme left and right individuals are more inclined to believe in conspiracy theories than moderates; they are more likely to have negative economic evaluations; and they are less politically and interpersonally trustful. By means of hierarchical regression analyses, we reveal a quadratic relationship between extreme political ideology and conspiracy beliefs. Moreover, we find a similar linkage between ideology and economic evaluations. However, the empirical analyses fail to provide evidence that extreme ideology is related to lower political and interpersonal trust.Keywords: political ideology, economic evaluations, trust, conspiracy belief, extremism Journal of Social and Political Psychology, 2017, Vol. 5(2), 435-462, doi:10.5964/jspp.v5i2.745 Received: 2016-12-08. Accepted: 2017-09-10. Published (VoR): 2017-10-28.Handling Editor: Małgorzata Kossowska, Jagiellonian University, Kraków, Poland *Corresponding author at: Nieuwezijds Voorburgwal 334 2 1012 RW Amsterdam, The Netherlands. E-mail: andre.krouwel@vu.nl This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.Throughout the 20 th century, radical political ideologies served as the propeller of tragic events that have left a deep mark in human history (Baumeister, 1997;Midlarsky, 2011). Movements of the radical right, such as Fascism and Nazism, were ideologically driven to commit unimaginable crimes against humanity which resulted in the death of millions. On the left, communist regimes in the former Soviet Union and its satellite states, as well as in numerous Asian countries were responsible for comparable atrocities. Even though there are substantial differences between these ideologies, political psychologists have noted that extreme left-and right-wing ideologies may share a similar underlying psychological pattern (Greenberg & Jonas, 2003). In order to assess whether rigid devotion to extreme political ideology on both the left and the right corresponds to a similar psychological under- jspp.psychopen.eu | 2195-3325 standing of the world, it is necessary to compare radical individuals and test if their comprehension of the functioning of society is identical. Journal of Social and Political PsychologyAlthough extremist regimes of the past are in many ways hard to compare to political actors that are considered relatively extreme in the current politi...