over-centralize
/ˌəʊvəˈsɛntrəlʌɪz/ /ˌəʊvəˈsɛntr(ə)lʌɪz/verb
[no object] To introduce too high a degree of centralization; especially to concentrate too much power or too many administrative functions in one place. Also with object: to centralize (administrative functions, etc.) excessively.
Origin
Early 20th century; earliest use found in American Historical Review. From over- + centralize.