This is an analysis of flank and shift effects in political sociology that focuses on anti-immigrant parties in eight European countries. In a positive radical flank effect the radical party makes the moderate and mildly-threatening parties look good. In turn, that moderate party then gains power or at least many of their ends. A negative radical flank effect occurs when the actual or perceived association of the moderate party with the radical party causes the moderate party to lose support. Radical shift effects are when the moderate or conservative party shifts its policy toward the radical direction. In this case, the radical party may become a coalition partner with the moderate or conservative party. And conservative or moderate shift is when the radical party shifts its policy toward a more moderate direction in order to assume power or court votes. The radical flank effects have some currency in the civil rights literature, but the other two effects have been largely ignored. This thesis shows that the radical shifts, radical flank, and moderate shift effects do have explanatory value in political sociology.