  Radio galaxies are excellent at tracing large-scale structure due to their
high bias. We present new results from the TONS08 radio galaxy redshift survey.
We find unequivocal evidence for a huge (at least 80 x 80 x 100 Mpc^3)
super-structure at redshift z=0.27, confirming tentative evidence for such a
structure from the 7C redshift survey (7CRS). A second, newly discovered
super-structure is also tentatively found at redshift 0.35 (of dimensions at
least 100 x 100 x 100 Mpc^3). Out of the total sample size of 84 radio
galaxies, at least 25 are associated with the two super-structures. We use
quasi-linear structure formation theory to estimate the number of such
structures expected in the TONS08 volume if the canonical value for radio
galaxy bias is assumed. Under this assumption, the structures represent ~ 4-5
sigma peaks in the primordial density field and their expected number is low
(10^{-2}-10^{-4}). Fortunately, there are several plausible explanations (many
of which are testable) for these low probabilities in the form of potential
mechanisms for boosting the bias on large scales. These include: the
association of radio galaxies with highly biased rich clusters in
super-structures, enhanced triggering by group/group mergers, and enhanced
triggering and/or redshift space distortion in collapsing systems as the growth
of super-structures moves into the non-linear regime. Similar structures could
have been missed in previous surveys because of the effects of Poisson-sampling
fluctuations.
