  The Berry curvature in magnetic systems is attracting interest due to the
potential tunability of topological features via the magnetic structure.
$f$-electrons, with their large spin-orbit coupling, abundance of non-collinear
magnetic structures and high electronic tunability, are attractive candidates
to search for tunable topological properties. In this study, we measure
anomalous Hall effect (AHE) in the distorted kagom$\acute{e}$ heavy fermion
antiferromagnet U$_3$Ru$_4$Al$_{12}$. A large intrinsic AHE in high fields
reveals the presence of a large Berry curvature. Moreover, the fields required
to obtain the large Berry curvature are significantly different between $B
\parallel a$ and $B \parallel a^*$, providing a mechanism to control the
topological response in this system. Theoretical calculations illustrate that
this sensitivity may be due to the heavy fermion character of the electronic
structure. These results shed light on the Berry curvature of a strongly
correlated band structure in magnetically frustrated heavy fermion materials,
but also emphasize 5$f$-electrons as an ideal playground for studying
field-tuned topological states.
