The nearby radio galaxy Centaurus A (NGC 5128) hosts a rich system of stellar streams, shells, and a thin, coherently rotating plane of satellite galaxies, with most satellites sharing the same sense of motion in a narrow spatial plane that also aligns with large-scale tidal debris (Malin et al. 1983; Müller et al. 2018). In ΛCDM, satellite systems around massive galaxies are expected to be roughly dispersion-supported and only mildly anisotropic, so the combination of strong, coherent tidal streams and a whirling satellite plane around Centaurus A is reproduced in fewer than about 1% of comparable simulated halos, suggesting a small-scale structure formation tension for the standard cold dark matter paradigm (Libeskind et al. 2015; Pawlowski 2018).