。
To remain silent is to admit guilt.
Literal
Be-silent-is [nominalizer-の] [topic-は] crime [object-を] acknowledge [nominalizer-こと] is.
An equational structure 'X is Y' built from two nominalizations: 黙っている is nominalized with の and made the topic, then 罪を認めること is nominalized with こと to be the predicate noun. Note the asymmetry — の and こと are not interchangeable but both serve here as ways to package a verbal predicate into a noun. Aphoristic, crisp.